u/Esmereldathebrave

Searching for a paperback, think the cover was black background with part of the NYC skyline on it maybe?

It's told from the point of view of a man who is either an architect or maybe lawyer for a developer. There's a plan to knock down a historic skyscraper, and he meets a young woman squatting in it who tells him that it's a castle and he's a knight. He's not sure if she really believes this or not. I think she convinces him the building needs saving, but then there's danger from mafia trying to develop it.

I think some of the stories she tells him are about the building being a crystal tower.

Ring any bells for anyone?