From an energy efficiency point of view, it would help if there were shared walls with the neighbors - i.e. something like an apartment building instead of little houses on individual little lots.

100 sq ft/person - when I was in grad school I had a bedroom about that size. In order to squeeze into something that tight, you would almost want shared bathrooms on each floor - much like a dormitory.

When I moved in with my girlfriend, we had to reduce the amount of stuff that we had by quite a bit. The hardest stuff for me to get rid of were books and papers - the rest of it, not so hard.

Ahh...books and papers. My basement stills holds mine, 20 years later. Y'a never know when you might need some notes on group theory (of the symmetry kind, not the social sciences).