Get the feel of it.  4 acre square, rectangle, other; will determine the number of spots. 

Hey JR, You can actually do this on listsource.com and isolate a neighborhood on a map by drawing a rectangle or circle

I like clean rectangles. 

The building was basically an empty, masonry 2,000 sq/ft rectangle.

The green rectangle below delineates what I call the rental sweet-spot.

These are what I call "simple brick" homes, rectangle shape, 1800-2200 sq ft. or so.

more details needed, square footage aprox, shape(square, rectangle, round) crawl or basement?

Some people say SFR some SFH; I know they are different (kind of like squares and rectangles where one defines the other but not reverse) but sometimes the get used interchangeably so I was just curious.

Actually, a regular rectangle island will look great too.

The red rectangle is the subject property, the 3-story town houses are to the left and at the bottom of the image you see the last section of the gated community of town homes.