An Expandable Modular Information Technology, IT, Facility, EMITF, that supports a large-scale modularly-constructed and expandable information handling system, LMIHS, comprising: an Expandable Modular Information Technology, IT, Building Infrastructure, EMITBI, the EMITBI having an initial enclosure comprised of: an initial base pad providing a fixed area of usable space on which one or more modular sub-components of the IHS can be placed; a plurality of exterior walls extending vertically from an outer perimeter of the base pad and connected to a roof structure, the plurality of exterior walls and roof structure collectively providing an outer perimeter of the initial enclosure of the EMITBI, within which a first maximum number of modular IT components can be housed, the plurality of exterior walls including at least one exterior wall that is constructed as a removable expansion wall, REW, that enables expansion of the usable space of the EMITBI, wherein the EMITBI protects the IT gear located therein and is expandable via the REW, wherein an expansion space is constructed directly adjacent to the existing EMITBI and outside of the REW, by later removal of the REW, without affecting the operation of the existing LMIHS within the initial enclosure of the EMITBI, wherein the expansion further includes the construction or installation of exterior side walls, ceiling and/or roof support structures, and a new external wall, and wherein the removal of the REW provides an expanded contiguous EMITBI that encompasses the additional usable space and thus allows for addition of more IT gear within a contiguous space; a plurality of modular IT components placed within the EMITBI on the usable space and operational as the LMIHS, wherein the EMITBI provides a protective enclosure, with a controlled environment, within which the LMIHS can operate without introducing exposure to an environment outside of the plurality of exterior walls, and wherein at least one of the plurality of modular IT components dissipate heat; and at least one air handling unit, AHU, in fluid communication with the enclosure to support cooling of one or more of the IT components within the enclosure. an Expandable Modular Information Technology, IT, Building Infrastructure, EMITBI, the EMITBI having an initial enclosure comprised of: an initial base pad providing a fixed area of usable space on which one or more modular sub-components of the IHS can be placed; a plurality of exterior walls extending vertically from an outer perimeter of the base pad and connected to a roof structure, the plurality of exterior walls and roof structure collectively providing an outer perimeter of the initial enclosure of the EMITBI, within which a first maximum number of modular IT components can be housed, the plurality of exterior walls including at least one exterior wall that is constructed as a removable expansion wall, REW, that enables expansion of the usable space of the EMITBI, wherein the EMITBI protects the IT gear located therein and is expandable via the REW, wherein an expansion space is constructed directly adjacent to the existing EMITBI and outside of the REW, by later removal of the REW, without affecting the operation of the existing LMIHS within the initial enclosure of the EMITBI, wherein the expansion further includes the construction or installation of exterior side walls, ceiling and/or roof support structures, and a new external wall, and wherein the removal of the REW provides an expanded contiguous EMITBI that encompasses the additional usable space and thus allows for addition of more IT gear within a contiguous space; a plurality of modular IT components placed within the EMITBI on the usable space and operational as the LMIHS, wherein the EMITBI provides a protective enclosure, with a controlled environment, within which the LMIHS can operate without introducing exposure to an environment outside of the plurality of exterior walls, and wherein at least one of the plurality of modular IT components dissipate heat; and at least one air handling unit, AHU, in fluid communication with the enclosure to support cooling of one or more of the IT components within the enclosure.