## Conventional street grid

A conventional scheme for development of the site shows 1427 single family houses on about 205 acres. Houses are placed according to zoning lot requirements on a street system previously adopted by the City. The result is a disastrously barren environment, and all of the natural character of the site is destroyed.

20

## Varied house types on loop streets

This scheme includes a full range of house-types: detached houses, semi-detached houses, townhouses, and townhouse apartments, totalling 1445 dwelling units. This mix of houses is organized around a p-loop street system, in which each loop serves only the houses on it. Within each loop a sizeable common open space with recreational facilities is formed, and all the loops together enclose a large parkland running along the ridge and into the center of the site. Again, school and shopping facilities are provided, and the natural beauty of the site is respected.

or this

4

Site plan shows townhouses arranged on a modified grid street system. Note that, by making minor modifications in a typical grid system, through traffic can be eliminated; that the resulting building placement defines a series of open spaces, private and common; and that spacing between the buildings is generous.

or this

3

Site plan shows townhouses arranged around a horseshoe loop and cul-de-sac street system. Note that the streets are solely for the use of the individual townhouse clusters; that each cluster encloses meaningful open space accessible through the private yards of individual houses; and spacing between building groups is very generous.

but this

2

Site plan shows a variety
of house types arranged
around a loop street system.
Note that streets serve only
houses on the loops; that the
houses are oriented toward
their private yards; that large
areas of common open space
are provided in the interior
of each loop; and that the
distance between structures is
never less than 20 feet.

4-14 Zero-lot-line development involves locating the house next to a side yard property line. The most common variation is placement of the house three to five feet from the adjacent property line and the provision of a use easement along that side of the unit. Typical side yards total 10 feet wide except where windows or garages reduce that width to eight feet. Source: David R. Jensen/HOH Associates, *Zero Lot Line Housing* (Washington, D.C.: ULI—the Urban Land Institute, 1981), p. 11.

4-15 Typical "Z" lots and houses. Source: Richardson, "Designing High-Density Single-Family Housing," p. 19.