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SCOPE OF THE INVENTION 
     The present invention relates to a building or condominium structure which includes two or more vertically stacked building units, and in particular, a stacked building unit construction consisting of at least two self-contained units, each having areas of both conventional ceiling height and areas having higher cathedral or loft-type ceilings and which is further characterized by a planar parallel horizontal uppermost ceiling and lowermost floor surface arrangement. 
     BACKGROUND OF THE INVENTION 
     In the development of urban centres over the past century, there has been a corresponding rise in the density and height of not only commercial buildings, but also residential apartment buildings and condominiums as land costs have increased. As a result, in major urban centres it is common to construct multiple dwelling unit condominiums and apartment buildings which consist of a number of vertically stacked units. Such buildings range in height from two or four storeys in the case of low-rise buildings to high-rise towers of thirty storeys or more. 
     With the progressing densification of cities and increased development, developers are continuously attempting to differentiate each new apartment building or condominium from adjacent properties, in an effort to better attract tenants and prospective buyers. To date, the majority of buildings and condominiums are differentiated from each other by the level of quality of materials which are used to finish not only the individual building or living units themselves, but also common areas such as the building lobbies and hallways. In addition, where space permits, an apartment building or residential condominium building may also house a swimming pool or health club facility to provide an enhanced living space for tenants. 
     Heretofore, the ceiling heights of individual building units which define the self-contained living spaces for the tenants or condominium owners have remained largely homogeneous, and most typically are selected at between 7.5 and 12 feet. The nature of vertically stacked building unit construction makes it difficult to include within the building customized units which may have individual rooms with higher cathedral or loft ceilings or which otherwise have a differing vertical height from either vertically and/or horizontally adjacent units within the building, or for that matter separate living areas within the unit itself. In particular, to ensure structural stability, it is preferred that the load-bearing walls and/or supports of the building extend vertically from the foundation, and cover vertically the entire height of the building. As a result of concerns of structurally weakening the building, there has been a reluctance to include within buildings, units having differing ceiling height configurations, for fear that this would necessitate additional structural reinforcement and architectural input. 
     Although some developers may include as top floor or penthouse suites customized units which have increased ceiling height, such units are typically restricted solely to the uppermost floor of a building. The inventor will further explain how two types of vertically stacked condominium units can easily overcome any difficulties and also how easy it will become to include building units with different height configurations at any level of the vertical structure with no additional structural reinforcement or architectural input. 
     SUMMARY OF THE INVENTION 
     Accordingly, it is an object of the present invention to overcome the disadvantages of existing building constructions by providing a building structure which may be incorporated into any conventional low-rise or high-rise commercial or residential building without significantly altering the load-bearing walls or support configuration for the building. The building structure includes at least one pair of vertically stacked units. Each unit defines a self-contained space and includes a primary area having a cathedral or loft ceiling which is characterized by a ceiling height of 1.5 storeys from the conventional height, and a secondary area which has a conventional one storey ceiling height. The primary and secondary areas of each pair of stacked units are configured so as to provide the building structure with a planar horizontal uppermost ceiling surface and a planar horizontal lowermost floor surface, covering three conventional storeys in height for a first type A module and 2.5 conventional storeys in height for a second alternate type B of module. 
     Another object of the invention is to provide an improved building structure which includes at least one pair of vertically stacked units and which are defined laterally by three parallel opposing common sidewalls which function as load bearing walls. 
     A further object of the invention is to provide a building construction for a condominium or apartment building which consists of two vertically stacked units, each having a primary living area having a ceiling height of about 1.5 storeys and a secondary living area having a conventional one storey ceiling height, and which may be incorporated into the building during its construction as a module in place of any three vertically stacked conventional single storey units. 
     Another object of the invention is to provide a building structure which is characterized by at least one pair of vertically stacked units, each having a primary living area with a cathedral ceiling, and which may be incorporated within the load bearing wall configuration of a building design as a building module, without requiring additional structural reinforcement or significant architectural revision to the building. 
     Another object of the invention is to provide a building or condominium unit construction which includes two building units, each defining a self-contained living space, and which are positioned vertically adjacent to each other, wherein one of the units has a primary living area with a cathedral-type ceiling of approximately and more preferably exactly 1.5 storeys in height, and a secondary living area which comprises a conventional one-storey height floor. The other unit has a primary living area with a cathedral-type ceiling of 1.5 storeys in height and a secondary living area which comprises two one-storey height floors. 
     A further object of the invention is to provide a building construction for an apartment building or condominium which permits two or more separate prestige level dwelling units to be placed in a vertical arrangement, while using substantially the same vertical superstructure and materials of a conventional low-rise or high-rise building, and which presents parallel and planar upper ceiling and lowermost floor surfaces. 
     The present invention provides a building structure or construction which is suitable as a two-unit building module which may be incorporated into a variety of multi-storey commercial or residential buildings. The building structure includes two vertically stacked units which each define a respective self-contained space. As a module, the building structure extends vertically downward from a planar ceiling surface which forms the upper extent of the uppermost unit to a planar lower floor surface of the other unit. Together, the pair of stacked units has an overall height equal to three full storeys for a type A module in accordance with a first embodiment of the invention and 2.5 storeys for a type B module in accordance with a second embodiment. Most preferably, the height is selected between twenty-three and thirty-six feet, depending upon the respective building structure (7.5-12 feet). 
     Laterally, the building module is bordered on each side by load-bearing support pillars or sidewalls (hereinafter collectively referred to as load-bearing walls) which extend the height of the building. An interior dividing load-bearing wall is positioned within each of the units between the load-bearing sidewalls, and which divides each unit into primary and secondary living areas or spaces. Although not essential, most preferably, the interior dividing walls of each unit are vertically aligned directly with each other and operate as an internal load-bearing wall. 
     For type A building module, the principal living area of the uppermost unit is positioned directly above and separated from the principal living area of the lower unit by a floor surface which spans between the interior dividing bearing wall and a first one of the sidewalls. The floor surface of the upper principal living area is located approximately and more preferably exactly midway between the upper ceiling surface of the uppermost unit, and the floor surface of the lowermost unit. Most preferably, the ceiling height in the principal area of each vertically adjacent unit is approximately or exactly equal to one-half the overall vertical height of the building module. 
     For type A module, a remaining secondary area of each unit is defined by the space bordered laterally by the interior dividing bearing wall and the second other load-bearing sidewall. The secondary areas of the units are divided vertically by two secondary floor surfaces, so as to define three stacked floors of a conventional one-storey height. 
     The type A lower unit of the module consists of a primary area having a cathedral-type ceiling and a secondary area consisting of a one storey living area. The type A upper second unit of the module consists of a primary living space with a cathedral ceiling, and a secondary living area which consists of two vertically stacked floors, each of one storey height, and more preferably which are always stacked vertically adjacent to the secondary living area of the other unit. 
     It is to be appreciated that doorways are formed through the dividing wall in each unit to permit passage between the primary living area and secondary area. To minimize the space required for stairways and stairwells, the uppermost unit is preferably provided with a secondary area which includes the two vertically stacked floors. This configuration advantageously requires that only the upper unit be provided with stairs and a stairwell. 
     For type B module, the principal living area of the uppermost unit is positioned above the secondary living area of the lower unit and is separated by a floor surface which spans between the interior dividing bearing wall and a first one of the sidewalls. The primary floor surface is located exactly one conventional storey height from the floor surface of the lowermost unit. 
     For type B module, the secondary living area of the top unit has two different ceiling heights. Accordingly, the first part of the secondary unit that is placed exactly above the primary living area of the bottom unit, covers the exact surface of the primary area of the bottom unit, and is located exactly one-half conventional storey height from the floor surface of the lowermost unit. The totally remaining space of the secondary living area of the top unit is characterized by a height of 1.25 of the conventional storey height between its floor surface and the floor surface of the lowermost unit. The above described remaining part of the secondary living area of the top unit is placed exactly above the secondary living area of the bottom unit with a 1.25 height between the two vertically adjacent secondary living areas. 
     The type B upper unit of the module consists of a primary area having a cathedral-type ceiling and a secondary area which consists of two parts with two different heights. The front part surface of the secondary living area of the top unit is placed above the primary living area of the bottom unit and consists of a one conventional storey height living area. The total remaining area of the secondary living area of the top unit consists of 1.25 height of the conventional storey height and is placed exactly above the back part of the secondary living area of the lower unit. The back part of the secondary living area of the lower unit also consists of 1.25 height of the conventional storey height. 
     The type B lower unit will display exactly the same basic characteristics (patterns) of the type B upper unit. Accordingly, it consists of a primary area having a cathedral-type ceiling and a secondary living area consisting of two parts with two different heights. The surface of the lower secondary unit area, placed exactly and totally underneath the primary living area of the top unit, consists of one conventional storey height living area. The remaining area of the lower secondary living unit area, placed exactly underneath the secondary living area of the top unit, consists of a 1.25 height from the conventional storey height of the building. 
     An entrance into the lowermost unit may be provided along the lowermost floor surface of either the primary or secondary areas. The entrance at the top unit will be provided only at the upper floor of the secondary area of the top unit for type A and at the 1.25 height secondary area of the top unit for type B. 
     In the above described modules, each of the building units is accessible from a respective hallway which extends along a rear portion of each unit. Thus, for type A the bottom unit accessibility is from the secondary living area (7.5-12 feet) and accessibility for the top unit is from the top secondary living area (second level of the top unit). For type B the bottom unit accessibility is always from the 1.25 height secondary living area and accessibility for the top unit is always from the 1.25 height portion of the secondary living area. 
     A primary advantage of the building structure resides in the fact that the ceiling surface of the uppermost unit as well as the floor surface of the lowermost unit is formed as parallel horizontal slabs for both types of modules. Furthermore, insofar as the sidewalls, the middle wall and some portions of the back walls are positioned as vertical load-bearing walls, the configuration of the present building structure advantageously enables its inclusion in almost any conventional building more than three storeys in height (respective 2.5 height for type B), while avoiding the need to incorporate additional architectural reinforcement or specialized designs. Rather, one or more building modules could be incorporated in almost any building construction in place of any three conventional vertically stacked units (respective 2.5 for type B). 
     The present building structure permits increased adaptability allowing specialized units to be positioned not only at the top storeys of low rise or high rise buildings, but also provides the opportunity to be inserted as mid-storeys or bottom storeys with minimal design changes. Furthermore, it is envisioned that where one side or other portion of a building commands a preferred view, for example overlooking a park or water, an entire side of the building could be formed with upgraded building modules, each module incorporating the pair of units characterized by a primary living area having a cathedral ceiling height and secondary living area of a conventional one-storey height, or conventional 2×1 storey height for the top unit. Similar type of inclusion is available for type B module. Any remainder of the building which does not possess the desired view could be formed with more economical and modestly priced single storey units. 
     Accordingly in one aspect, the present invention resides in a building structure including a pair of building units, 
     a first one of said units being spaced vertically above the second other one of said units, said first and second units being laterally defined by a pair of parallel structural vertical sidewalls and each said unit further including an interior vertical dividing load-bearing wall interposed between and oriented generally parallel to said sidewalls, 
     a first generally horizontal ceiling surface spanning between said sidewalls and defining an upper ceiling of said first unit, 
     a generally planar horizontal floor construction spaced approximately three floors beneath said ceiling surface, said floor construction spanning between said sidewalls, 
     each of said units further including a principal area bordered laterally by a first one of said sidewalls and said dividing wall, and a secondary area bordered laterally by the dividing wall and the second other of said sidewalls, 
     the principal area of the first unit being spaced vertically directly above the principal area of the second unit and separated therefrom by a first horizontal floor surface spanning between said dividing wall and said first sidewall, said first floor surface being located approximately half way between said ceiling surface and said floor construction, 
     the secondary area of the first unit being spaced directly above and separated from the secondary living area of the second unit by a second horizontal floor surface being located approximately one floor height from said floor construction and two floor height from said ceiling surface. 
     In another aspect, the invention resides in a building construction for an apartment or condominium comprising, 
     a pair of building units each defining a self-contained living space, a first one of said units being spaced vertically adjacent to the second other one of said units, each of said first and second units including at opposing lateral ends vertically extending structural sidewalls, and further including an interior vertical dividing wall interposed between and parallel to said sidewalls, 
     a first generally planar horizontal slab spanning between said sidewalls and defining an upper ceiling of said first unit, 
     a second generally planar horizontal slab spaced approximately 22 to 36 feet vertically beneath said first slab, said second slab spanning between said sidewalls and defining a lower floor of said second unit 
     each of said units further including a principal living area defined by a first one of said structural sidewall and said dividing wall, and a secondary living area defined laterally by the central dividing wall and the second other one of said structural sidewall, 
     the principal living area of the first unit being spaced vertically above the principal living area of the second unit and separated therefrom by a horizontal first floor surface spanning between said dividing wall and said first structural sidewall, said first floor surface being located approximately half way between said first slab and said second slab, 
     the secondary living area of the first unit being spaced above and separated from the secondary living area of the second unit by a horizontal second floor surface, said second floor surface being located approximately one third the distance between said first and second slabs, and 
     a horizontal third floor surface spanning between said dividing wall and said second structural sidewall, the third floor surface located said first slab and said second slab. 
     In a further aspect the invention resides in an apartment or condominium building module construction comprising, 
     a pair of units each defining a self-contained living space, a first one of said units being spaced vertically directly above the second other said unit, said first and second units being laterally defined by a pair of parallel vertically extending sidewalls, and further including an interior vertical dividing wall interposed between and parallel to said sidewalls, 
     a first generally planar horizontal slab spanning between said sidewalls and defining an upper ceiling of said first unit, 
     a second generally planar horizontal slab spaced vertically beneath said first slab, said second slab spanning between said sidewalls and defining a lower floor of said second unit, 
     each of said units further including a principal living area defined by a first one of said sidewalls and said dividing wall, and a secondary living area defined laterally by the dividing wall and the second other one of said sidewalls, 
     the principal living area of the first unit being spaced vertically directly above the principal living area of the second unit and separated therefrom by a horizontally extending principal area floor surface spanning between said dividing wall and said first sidewall, said principal area floor surface being located approximately half way between said first slab and said second slab, 
     the secondary living area of the first unit being spaced directly above and separated from the secondary living area of the second unit by a horizontally extending secondary floor surface spaced approximately one third the distance between said first and second slabs. 
     In another aspect, the present invention resides in an apartment or condominium building module construction referred to as type A module, and comprising, 
     a pair of units each defining a self-contained living space, a first one of said units being spaced vertically directly above the second other said unit, said first and second units being laterally defined by a pair of parallel vertically extending sidewalls, and further including an interior central dividing wall interposed between and parallel to said sidewalls, 
     a first planar horizontal slab spanning between said sidewalls and defining an upper ceiling of said first unit, 
     a second planar horizontal slab spaced about 3 storeys vertically beneath said first slab, said second slab spanning between said sidewalls and defining a lower floor of said second unit, 
     each of said units further including a principal living area defined laterally by a first one of said sidewalls and said dividing wall, and a secondary living area defined laterally by the dividing wall and the second other one of said sidewalls, 
     the principal living area of the first unit being spaced vertically directly above the principal living area of the second unit and separated therefrom by a horizontally extending principal area floor surface spanning between said dividing wall and said first sidewall, said principal area floor surface being located approximately 1.5 storeys above said second slab, 
     the secondary living area of the first unit being spaced directly above and separated from the secondary living area of the second unit by a horizontally extending secondary floor surface spaced approximately one-third the distance between said first and second slab. 
     In another aspect, the present invention resides in an apartment or condominium building module construction referred to as type B module which is characterized by, 
     a pair of units each defining a self-contained living space, a first one of said units being spaced vertically directly above the second other said unit, said first and second unit being laterally defined by a pair of parallel vertically extending sidewalls, and further including an interior central dividing wall interposed between and parallel to said sidewalls, 
     a first planar horizontal slab spanning between said sidewalls and defining an upper ceiling of said first unit, 
     a second planar horizontal slab spaced about 2.5 storeys vertically beneath said first slab, said second slab spanning between said sidewalls and defining the lower floor of said second unit, 
     each of said units further including a principal living area defined laterally by a first one of said sidewalls and said dividing wall, and a secondary living area defined laterally by the dividing wall and the second other one of said sidewalls, 
     the principal living area of the first unit spaced vertically directly above the secondary living area of the second unit, area characterized by a one-storey conventional height between the said second slab and the floor surface of the principal living area of the top unit; the horizontally extending principal area floor surface of the first unit spanning between said dividing wall and said first sidewall, said principal area floor surface being located one conventional storey above said second slab, 
     first part of the secondary living area of the first unit being spaced vertically directly above the secondary living area of the second unit, area characterized by 1.25 from the conventional height between the floor surface of the first part of the secondary living area of the first unit and the said second slab, 
     second part of the secondary living area of the first unit being spaced directly above the principal living area of the second unit, area characterized by 1.5 from the conventional height between the second part of the secondary living area floor surface of the first unit and the said second slab, 
     the first part of the secondary area of the top unit defined laterally by a first one of said sidewalls and the interior dividing wall, 
     the second part of the secondary area of the top unit defined laterally by the two end sidewalls, 
     the floor surface of the second first part of the secondary living area of the top unit located approximately or exactly half-way (1.25) between the said first slab and the said second slab, 
     the floor surface of the said second part of the secondary living area of the top unit located one conventional storey height from the first said slab and 1.5 from the conventional storey height from the second said slab. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Further objects and advantages of the invention will now become apparent from the following detailed description, taken together with the accompanying drawings in which: 
     FIG. 1 shows a perspective front view of a building incorporating a number of building construction modules in accordance with a first embodiment of the invention named type A module; 
     FIG. 2 shows a detailed front view of the layout of a single building construction module used in building in FIG. 1; 
     FIG. 3 shows a front perspective view of the module of FIG. 2; 
     FIG. 4 shows a plan view of the upper unit of the building module shown in FIG. 2 illustrating the uppermost storey layout of the primary and secondary living area; 
     FIG. 5 shows a plan view of the upper unit of the building module of FIG. 2 illustrating the lowermost storey layout of the secondary living area; 
     FIG. 6 shows a plan view of the lower unit of the building construction module shown in FIG. 2 illustrating the lower storey layout of the primary and secondary living area; 
     FIG. 7 illustrates a cross-sectional view of a building construction module shown in FIG. 3 taken along line  7 — 7 ; 
     FIG. 8 illustrates a right side view of the building construction module in accordance with the first embodiment of the invention; 
     FIG. 9 illustrates a detailed back view of the layout of a single building construction module shown FIG. 2; 
     FIG. 10 shows a perspective front view of a building incorporating a number of building construction modules in accordance with a second embodiment of the invention named type B module; 
     FIG. 11 shows a detailed front view of the layout of a single building construction module used in the building in FIG. 10; 
     FIG. 12 shows a front perspective view of the module shown in FIG. 11; 
     FIG. 13 illustrates a left or right side view of the building construction module used in the building of FIG. 10 
     FIG. 14 shows a detailed back view of the layout of a simple building construction module shown in FIG. 11; 
     FIG. 15 shows a plan view of the upper unit of the building module shown in FIG. 11 illustrating the layout of the primary and secondary living area; 
     FIG. 16 shows a plan view for the lower unit of the building module shown in FIG. 11 illustrating the layout of the primary and secondary living area; 
     FIG. 17 shows an exploded perspective view of the Type B building Module used in the building of FIG. 10; and 
     FIG. 18 illustrates schematically a front view of a building incorporating both building construction modules as shown in FIGS. 2 and 11, together with conventional one-story building units. 
     FIG. 19 illustrates schematically the front of a townhouse construction incorporating building construction modules as shown in FIGS. 2 and 11. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Reference is first made to FIG. 1 which illustrates low-rise residential condominium  8 A. The condominium building  8 A is of a six storey height and, as will be described, consists of eight identical vertically stacked and laterally positioned building construction modules (modules  10   a-f  shown) in accordance with a first embodiment of the invention named type A module, each of which is approximately or exactly 3 storeys in height. 
     FIG. 2 shows in front view the horizontal floor layout for the individual building construction module  10   a  as used in the construction of the low-rise condominium  8 A. Although module  10   a  has been shown for clarity, it is to be appreciated that the remaining modules  10  would be of the identical structure and configuration. The construction module  10   a  is formed having an overall generally rectangular shape which, as will be described, enables its location occupying the fourth to sixth floors of the building  8 , respective, the uppermost top three floors of the condominium unit. The building module  10   a  has an approximate height of about three conventional storeys which, depending upon the condominium  8  chosen conventional height, will have an average single storey height of between about 7.5 and 12 feet. 
     FIGS. 3 to  6  show best the configuration of the individual units  14 , 16  building construction modules  10  as each including two individual condominium units  14 , 16 , each of which defines a respective self-contained living space. The unit  14  is vertically stacked directly on top of the unit  16 , with the individual module  10  extending vertically from a concrete slab floor  20 , which defines the lowermost extent of the bottom-most unit  16 , to an upper horizontal concrete slab  22  which defines the ceiling surface of the uppermost unit  14 . The vertical sides of the module  10  comprise a pair of parallel vertical sidewalls  26 , 28  which, as will be described, consist of respective pairs of load-bearing sidewalls  26   a , 26   b  and  28   a , 28   b  which act as load-bearing sidewalls for each unit  14 , 16 , respectively. 
     As shown in the front view of FIG. 2, the units  14 , 16  have the identical lateral width, each extending laterally from their respective common left side load-bearing sidewall  26   a , 26   b  to the opposing parallel right side load-bearing sidewall  28   a , 28   b . It is to be appreciated that the load-bearing sidewalls  26   a , 26   b  and  28   a , 28   b  are positioned in direct vertical alignment with not only each other, but also the load-bearing sidewalls  26 , 28  of other vertically adjacent modules  10   c  (FIG. 1) so as to extend substantially the vertical height of the building. The sidewalls  26   a , 26   b  and  28   a , 28   b  are oriented parallel to each other and extend from an outer face  32  (FIG.  1 ) of the building  8 , rearwardly to a rear wall  33  (FIG.  4 ). As shown best in FIGS. 4 to  6 , the rear wall  33  borders a common building hallway area  34 , which permits access to the individual units  14 , 16 . 
     In the case of buildings  8  more than four conventional storeys in height, the load-bearing walls  26 , 28  of the building  8 A most preferably consist of poured concrete walls which are positioned directly above and vertically aligned with concrete walls extending upwardly from the foundation of the building  8 A to provide the maximum degree of support and structural integrity. It is to be appreciated, however, that reference to “load-bearing wall” includes not only continuously poured concrete walls, but also walls which consist of load-bearing supports or posts and other non-structural elements. 
     The horizontal width of each module  10  is additionally divided internally by a respective load-bearing partition wall  30  which extends from the floor  20  to the ceiling slab  22 . The partition wall  30  most preferably is vertically aligned with the partition walls  30  of other vertically spaced modules  10 , and although not essential, most preferably is oriented parallel to the sidewalls  26 , 28 . The partition wall  30  extends rearwards from the building face  31  a distance part way towards the rear wall  33  (FIG.  1 ), and separates the units  14 , 16  laterally into respective primary living areas  36 , 37  and secondary living areas  38   a , 38   b , 39 . 
     As shown best in FIG. 2, the primary living area  36  of the upper unit  14  is located directly above the primary living area  37  of the lowermost unit  16 . The primary living areas  36 , 37  of the units  14 , 16  are separated from each other by a floor slab  40  formed mid-way between the lower concrete slab  20 , and the ceiling slab  22 . Furthermore, the slab  40  acts as the ceiling of the lowermost primary living area  37 , and its positioning provides each primary living area  36  with a loft or cathedral-type ceiling having a height ranging approximately between 12 and 18 feet, depending upon the overall vertical height of the module  10 . 
     FIGS. 4 to  6  show the concrete slabs  20 , 40 , 46 , 50  as projecting forwardly from the front walls of each floor of the primary and secondary living areas to function as terraces  43  or balconies. It is to be appreciated that the projecting floor slabs may be omitted, or in an alternate arrangement, the projecting portions of the slabs  20 , 40 , 46 , 50  could be enclosed as a sunroom or other living area. 
     As shown best in FIGS. 4 to  6 , at their rearwardmost extent, the primary living areas  36 , 37  of both of the units  14 , 16  are bordered by an internal vertical wall  42  which is positioned in an orientation generally perpendicular to the sidewall  26 . The internal wall  42  is spaced forwardly from the rearwall  33  a distance selected to define a respective rear hallway area  44   a , 44   b , 45  behind the primary living area  36 , 37  in each unit  14 , 16 . 
     The secondary living area  39  of the lower unit  16  is delineated at its upper extent by a concrete slab  46  which spans the distance between the dividing wall  30  and the right-hand sidewall  28 . In addition to forming a ceiling surface for the secondary living area  39 , the slab  46  functions as the lowermost floor surface for the secondary living area  38   b  of the upper unit  14 . As shown in FIGS. 2 and 3, the slab  46  is most preferably located approximately one-third of the distance between the floor slab  20  and ceiling slab  22  of the module  10 . In this position, the slab  46  provides the secondary living area  39  of the lowermost unit  16  with a ceiling height of approximately one standard storey and most preferably approximately 7.5 to 12 feet. Most preferably, as shown in FIG. 2 the slab  46  further extends laterally behind the primary living area  37  of the lower unit  16  as the ceiling surface of the rear hallway area  45 , and separates the rear hallway area  44   b  of the upper unit  14  from the area  45  of the lower unit  16 . It is to be appreciated that with this configuration a portion of the upper unit  14  drops approximately 0.5 storeys behind the primary living area  37  of the lower unit  16 . 
     Both the secondary living area  38   a , 38   b  and rear hallway area  44   a , 44   b  of the upper unit  14  are further sub-divided vertically by a second horizontal concrete slab  50  which spans between the dividing wall  30  and the second load-bearing wall  28 . The slab  50  is positioned mid-way between the floor slab  46  and the ceiling slab  22 , thereby dividing the upper unit secondary living area  38  into  38   a  and  38   b  single storey upper and lower floors  52 , 54 . Like the slab  46 , the slab  50  extends rearwardly behind primary living area  36  to the left load-bearing wall  26 , dividing the hallway area  44   a  and  44   b  into upper and lower hallways  56 , 58  (FIG.  2 ). 
     FIGS. 2 and 3 show best a doorway  60  as being provided at the junction of the upper hallway  56  and the dividing wall  30 . The doorway  60  leads to a rise of stairs  62  extending  0 . 5  storeys in height and providing access between the primary living area  36  of the upper unit  14  and its upper storey  52  and hallway  56 . A second stairwell  64 , 0.5 storey in height, leads from the primary living area  36  to the lower hallway  58 , to enable movement between the primary living area  36  and the lower storey  54 . It is to be appreciated, however, that if desired other stair configurations and locations could also be incorporated. 
     FIG. 4 shows best an entrance door  66  as being provided in the upper hallway  56  and permitting access to and from the unit  14  into the common hallway area  34 . If desired, a second entrance way could also be provided on the lower storey  58 . 
     FIG. 4 shows best the plan view of the second storey  56  for the upper unit  14  with the hallway  56  extending above the stairwell  64 . In the configuration as shown, the upper floor  52  includes a closet  72  as well as washrooms  74  and bedrooms  76 . Similarly, FIG. 5 shows the lower floor  54  as including a kitchen  78 , bedroom  80 , and library plus den  81  and bedroom  82 . It is to be appreciated that other room configurations could also be used. Although not shown, either the hallway  58 , 56  could, for example, include additional storage areas, powder rooms, or the like. 
     The layout for the lower unit  16  is seen best in FIG. 6. A doorway  84  provides access between the primary living area  37  of the lower unit  16  and its secondary living area  39 . The secondary living area  39  further includes an entrance doorway  66  providing access to the common hallway  34 . As in the upper unit  14 , the secondary living area  39  of the lower unit  16  houses a library  78  as well as washrooms  74  and bedrooms  76 . It is envisioned that the primary living area  36 , 37  of each unit  14 , 16  could, for example, function as a living room or great room area. Although not essential, the primary living areas  36 , 37  could include floor to ceiling windows  41  (FIG. 1) and/or the terrace walkouts  43  could be omitted, depending on the overall look of the building  8 A to be achieved. 
     In the case of a low-rise building  8 A, stairs  86  (FIGS. 4 to  6 ) may be provided in the common hallway  34  to allow floor access. It is to be appreciated that other internal and external stair configurations may also be possible, including a stair construction housed entirely within the units  14 , 16 , without departing from the spirit and scope of the invention. 
     The lateral extent of the building module  10  may be selected at almost any size. When the building module  10  is included within a building having a number of vertically stacked conventional one storey units, most preferably the module  10  has a lateral extent corresponding to that of any other vertically and/or horizontally adjacent conventional units. 
     The building construction modules  10  provide a profile which enables its installation in a building in place of any three vertically aligned one storey units, without altering the configuration of the load-bearing supports or walls. Furthermore, insofar as each construction module  10  includes planar and parallel lower and upper slabs  20 , 22 , the module  10  could be provided virtually anywhere in the building, using existing construction techniques. As such, the building construction module  10  of the present invention allows the comparatively simplified incorporation of premium or luxury dwelling units in place of three vertically stacked one storey units almost anywhere within condominium building  8 A, without requiring structural modifications or significant architectural changes. Because the building module  10  is characterized by planar parallel surfaces  20 , 22 , the module  10  may be incorporated in a building  8 A at almost any location with virtually no change in the load forces applied to load-bearing walls  26 , 28 , 30 . 
     Although the preferred type A embodiment of the invention discloses the upper unit  14  as having a secondary living area  38  divided into upper and lower storeys  54 , 52 , the invention is not so limited. It is to be appreciated that the secondary living area  39  of the lower unit  16  could consist of the two one storey floors, with a corresponding placement of the stairwell therebetween. In such a configuration, access to the upper unit  14  would be achieved through the hallway  58  at the third floor level of the module  10 . 
     Similarly, although the detailed description illustrates the building units  14 , 16  as consisting respectively of a single primary living area  36 , 37  and a single secondary living area  38 , 39  the invention is not so limited. If desired, each unit  14 , 16  could also include additional secondary and/or primary living areas spaced laterally on either side of the load-bearing walls  26 , 28 . 
     Although for clarity, the module  10   a  shown in FIG. 2 is described as having a concrete floor  20  and left and right side-walls  26 , 28 , it is to be appreciated that the floor  20  and ceiling  22  of a given module  10  would also function as the ceiling and floor of a next vertically spaced lower and upper module  10 . Similarly, the left and right sidewalls  26 , 28  would also function as a common load-bearing sidewall  28 , 26  of a next horizontally adjacent left or right positioned module  10 . 
     Although FIGS. 1 to  9  illustrate the building module  10  as being used in a low-rise building  8 A, it is to be appreciated that the invention is not so limited. If desired, one or more modules  10  could equally be incorporated in high-rise buildings in place of corresponding three vertically stacked one-storey units. 
     Reference may be made to FIGS. 10 to  16  which show a building  8 B incorporating a number of building construction modules  100   a-f  in accordance with a second embodiment of the invention, and wherein like reference numerals are used to identify like components. The modules  100   a-f  are of an identical or mirror construction and consist of upper and lower units  14 , 16  which, like the embodiment shown in FIGS. 1 to  9 , each include a respective primary living area  36 , 37  and a secondary living area  38 , 39 . 
     The module  100  of FIG. 10 has an overall height of approximately 2.5 conventional storeys with the secondary living area  38 , of the unit  14  consisting of a single one-storey unit positioned vertically directly above the primary living area  37  of the second other unit  16 . The secondary living area  39  of the lower unit  16  is positioned directly below the primary living area  36  of the upper unit  14 . This configuration advantageously provides the primary living area  36 , 37  of each unit  14 , 16  with a cathedral height ceiling of 1.5 storeys. 
     The secondary living area  38  of the unit  14  is separated from the primary living area  37  of the unit  16  by a floor slab  48   a  (FIG. 1) formed one conventional storey height from the ceiling slab  22  and 1.5 from the conventional storey height above the lower concrete slab  20 . The primary living area  36  of the unit  14  is separated from the secondary living area  39  of the unit  16  by a floor slab  48   b  formed 1.5 from the conventional storey height from the ceiling slab  22  and one conventional storey height above the lower concrete slab  20 . 
     As with the earlier described module  10 , a rear hallway area  44 , 45  is provided behind the primary and secondary living areas  36 , 38  and  37 , 39  of each unit  14 , 16 , respectively. The hallway areas  44 , 45  extend laterally between a rear wall  33  of each unit  14 , 16  and their respective primary and secondary living areas  36 , 38  and  37 , 39 , and in one possible construction may possibly incorporate kitchens  78 , washroom  74  and or closets. Vertically, the hallway areas  44 , 45  are separated by a concrete slab  49 . FIG. 14 shows the concrete slab  49  placed approximately or exactly midway between the upper and bottommost slabs  22 , 20  and spanning (horizontally) between the load-bearing walls  26 , 28  of the building  8 B. It is to be appreciated that with this configuration, both of the rear hallway areas  44 , 45  have a ceiling height of approximately 1.25 storeys in height. 
     As shown best in FIG. 8, a stairwell  62  provides access between the primary living area  38  of the upper unit  14  and its secondary living area  28 . FIG. 11 shows best the upper unit  14  as including additional stair riser units  63 . The additional stair units  63  permit access between the primary living area  36  and the secondary living area  39 . Depending on the layout of the building  8 , additional stair units  63  may also be provided to facilitate access not only to exterior hallways, but between the living areas  36 , 38  or the hallway and bedrooms  76  as well. 
     FIGS. 10 to  16  illustrate a module  100  which in the front view of FIG. 11 illustrates the primary living area  36  as being bordered by the sidewall  28 . It is to be appreciated, however, that the module  100  could equally be formed in the mirror arrangement of FIG.  17 . 
     As with the units  14 , 16  of the module  10  shown in FIG. 1, in the module  100  one or more bedrooms  76 , a kitchen  78  and bathrooms  74  are located within the rear hallway areas  44 , 45  and secondary living areas  38 , 39  of each unit  14 , 16 . 
     Although FIGS. 2 and 10 illustrate buildings  8  which are composed entirely of a number of identical building construction modules  10 , 100 , it is to be appreciated that the present invention may equally be provided as part of the building having other conventional one storey units. As indicated, the building modules  10 , 100  of the present invention could further be provided as either lowermost storeys of the building, the uppermost storeys of a building or for that matter, spaced at various mid-storeys as market forces may permit. 
     By way of non-limiting example, reference may be had to FIG. 18 which illustrates schematically one possible alternate high-rise building  8  in which like reference numerals are used to identify like components. The building  8  of FIG. 18 is shown as incorporating a number of the building modules  10  in accordance with the first embodiment of the invention, shown by reference numeral  120  as occupying the uppermost six storeys of the building  8 , a number of modules  100 , shown by reference numeral  122  as occupying the middle five storeys of the building  8 , and a lowermost zone  124  of single conventional one storey residential units  126 . 
     Although the detailed description describes the present construction modules as being used in concrete based structures, any brick or wood structure having a design appropriate for a model A or B module may be used in a townhome or detached home construction. By way of non-limiting example, FIG. 19 shows one such townhome construction in which like reference numerals are used to identify like components. In such a townhome or detached home construction, the modules (A or B) remain substantially of the same design, with a garage attached in front of each module. 
     Although the Figures illustrate various preferred embodiments, the invention is not so limited. Many variations and modifications will now occur to persons skilled in the art. For a definition of the invention, reference may be had to the appended claims.

Summary:
A building structure suitable as a two-unit building module which may be incorporated into a variety of multi-storey commercial or residential buildings. The structure includes two vertically stacked units which each define a respective self-contained space. As a module, the building structure extends downward from a planar ceiling surface which forms the ceiling of an uppermost unit to a planar lower floor surface of the second lower other unit. Together, the pair of stacked units has an overall height equal to two and one-half to three full storeys, and a height selected between twenty-three and thirty-six feet, depending upon the respective building structure (7.5-12 feet). The building module is bordered on each lateral side by load-bearing support pillars or sidewalls which extend the height of the building. An interior dividing bearing wall is positioned within each of the units between the load-bearing sidewalls, and which divide each unit into primary and secondary living areas or spaces. The principal living area of the uppermost unit is positioned directly above and separated from the principal living area of the lower unit by a floor surface which spans between the interior dividing walls and a first one of the sidewalls, and which is located midway between the upper ceiling of the uppermost unit, and the floor surface of the lowermost unit. The remaining secondary area of each unit is defined by the space bordered laterally by the interior dividing wall and second other load-bearing sidewall, with the units divided vertically by two secondary floor surfaces, so as to define three stacked floors of a conventional one-storey height.