To put this in a European perspective: the legal minimum floor area to rent out an apartment in France is 9 square meters, or slightly less than 97 sq feet.

Even better (or worse, depending on your perspective): the absolute minimum is a volume of 20 cubic meters [1].

Therefore in cities like Paris where flats with high ceilings abound, you find owners of big, old apartments with 3m high ceilings breaking them up in 7 sq meters (75 sq feet) "studios"...

250 sq feet is aplenty.

[1] http://www.adil75.org/pdf/av12.pdf (in French)