I am the author of a book on the usage of Unity for Architectural Visualization. It is meant for architects and students who want to go beyond an out-of-the-box architectural visualization solution and get hands-on with creating compelling, creative and interactive architectural environments.
I do hope that this book fills a gap in the available knowledge resources on Unity. I certainly wish that I had such a book when I started teaching Unity to our students of architecture.
The book can be pre-ordered right now at Packt and some other online book stores.