For some niches, it might very well depend on how well you know the building types in your area and what market forces are at play. Understanding that could give you an edge when combined with your architectural skills. It might narrow down to one residential building type. I’m in Santa Monica, California. There are specific design and code requirements that forces some very specific design solutions in Venice, CA and the climate along the coast. There are also more Lately, we’ve been seeing here two or three story luxury units on infill lots near the new light rail line coming to Santa Monica, or 7 story residential. An apartment type that interests developers that is filling a specific market could be something to look at. I know that developers here cruise websites to find architects that are doing something they’re interested in.