>The difference in cost between building a $1000/mo apartment and a $3000/mo apartment is negligible to the builder. So you decrease the square footage from 14

>The difference in cost between building a $1000/mo apartment and a $3000/mo apartment is negligible to the builder. So you decrease the square footage from 1400 to 700. You have to have customers willing to buy your product, and there are only so many $3000/month apartments you can make before you run out of people willing to pay that much. Either large numbers of last year's luxury places are moving downmarket or you won't be able to sell the building for what you expected.