Thanks to Harry Lim in Orlando, FL for pointing this video out to me.
This is a meticulous demonstration by Roger Brooks, a Architectural and Interior Photographer in Vancouver, BC demonstrating a lighting/post process layering technique commonly used in high-end Architectural Interior photography.
Note that I show it here as an educational illustration of how many Architectural and Interior photographers work. This is not something you typically do for real estate photography because real estate photographers are typically not getting paid to spend this much time on a single image. It does show how carefully lighting is controlled in upper-end Architectural and interior photography.