[oh_sigh]

It is more expensive to build a separate entrance for certain classes, not less expensive.

And those kind of affordable housing schemes are a joke from a social perspective. Yes, it's great if you win the lottery. But it doesn't do much for the 99.998% of people who don't win the lottery.

[nitrogen]

It's probably still a net win to build separate entrances if they would lose significantly more money on decreased value of the non-subsidized units than the separate entrances would cost.