There’s a lot of interest in investing in places like Nashville and other strong secondary markets right now. This is due to economic and cultural factors driving people out of more traditional markets. Plus, when you consider the quality of life in much larger downtowns, it's no wonder smaller, homier downtowns are the next big thing. These secondary markets prime for investing are great tourist destinations, just like Nashville. They are also key areas for music and the arts, just like Nashville. Here's what these secondary markets desperately need: Residential condo units. (Last year, Nashville gained a mere 71 units.)