Except such mandates never exist, the only mandates on unit sizes are minimums, not maximums. Though I do propose such changes as part of my "urban planning is

Except such mandates never exist, the only mandates on unit sizes are minimums, not maximums. Though I do propose such changes as part of my "urban planning is 100% wrong, simply replace the direction of every single cap and you will get a better result plan", this has not caught on with anybody but me. Also, rich people still get around maximums by joining together adjacent units. For example, SF board of supervisors (think city council) member Aaron Peskin did this with two units so that he could have a bigger more luxurious living space, even though nobody else is allowed to bend the permitting rules that way. (SF has permitting rules that disallow making two units into one, but it does not have any limits on maximum unit size, as far as I can tell.)