[jacobolus]

I’m tempted to tell you to take your hostile insulting response and shove it. WTF?

Most municipalities in the US has some kind of minimum dwelling size, sometimes varying by zone. They can be anywhere from a few hundred square feet to about a thousand square feet (or occasionally bigger). Like other local laws, they vary widely in the details.

You can check local municipal zoning codes for whatever specific community you are interested in. San Jose is one of the rare places which apparently does not have such a rule. Though sometimes building codes enforce minimum sizes when zoning laws per se do not – I don’t care enough to go read through the San Jose building codes.

For more general discussion, if you do a web search for “minimum house size” you will get millions of results.