But how much do we actually know about the developer's ability to "complete the project within the guidelines"? If there must be document filings and approvals to get a building off the ground, then there's also a point at which the developer realizes a return on investment. The thing is, if zoning is restricting the size, shape, or use of your building, you're less likely to turn a profit, and your motivation for development is gone
(Something else she talked about is diversity of uses, and its implicit benefits for city life. Once you stop dictating what kind of buildings can go where, you can gain a much more vibrant urban environment. Just another thing to think about.)
But how much of the squalor was because of a lack of zoning?
But there's another arbitrary dimension to it all: the granting of zoning variances. How often do we see certain developers get preferential treatment to build something closer to what they want, while others get turned away? It happened just recently with Trump's project in SoHo.