"One of the first things I look at before I view the house is the MLS. In my area we have a 17-day average on market. Some houses will sell in less than 10. Some may sell in 23. Once it hits 30-plus days, it is a huge red flag to me. There are multiple reasons why a home won’t sell. It could be a bad shape home, greedy sellers, or simply a bad-at-marketing agent. But again, if I see 30-plus days, I become more skeptical."