This is a fine introduction to topics in the aesthetics of architecture.
The book makes a big show at the beginning about the importance of a phenomenological as opposed to formalist approach to thinking about architecture, but it's hard to see how that approach makes a substantial difference in terms of the kinds of things that actually get said about architecture in the book. It's most present in the discussion of the work of Steven Holl, who explicitly uses phenomenological concepts in designing his buildings.
There is an interesting chapter on architecture's status at the bottom of the fine arts totem pole, and worthwhile discussions comparing architecture to music (it is "frozen music", according to Schelling), and to film (via a discussion of Wenders's Wings of Desire).
The final chapter is a criticism of le Corbusier-style urban utopianism as well as "the new urbanism" that inspired towns like Seaside, Florida. These are pretty soft targets.
I might just be ignorant of the relevant literature, but it doesn't seem philosophers have yet started seriously arguing about central architectural concepts like "form" or "space" or whatever in the way they argue constantly about representation or expression or meaning or truth in other arts.