The lot is a long rectangle in shape and measures 4 acers.

I couldn't quite make out the brown rectangles on the walls. 

All squares are rectangles, but not all rectangles are squares

Homes that old also have a bit of settling, I've yet to cut a perfect rectangle of a door.  

The unit was designed as a rectangle with the living space/kitchen situated between both bedrooms to optimize privacy for occupants, no shared walls are hard to find in the Bay Area.

All squares are rectangles, but not all rectangles are squares.

Then you pay a glass company to cut you a rectangle of glass for your 1/2 shower wall, and you're done. 

In both, our property is represented by a yellow rectangle.

I drawn up a site plan , looks like the 10k sqft building will fit, the land is flat and almost rectangle, with set back and required landscape, I still have 52+ parking.I plan to build and hold on it, as a steady income for retirement,  maybe use one or two unit by myself, as my wife always want to try a coffee/ice-cream/yogurt  shop. 

Do your layout and talk with those trades.Example:Lets assume you do just one road with two entrances, one at each end.  20 acres if a rectangle is 1,320 feet long.