I read that the banks often set minimum rents on the commercial real estate built or renovated with their loans. The minimum is too high for most any business to be profitable, so you see a series of failed attempts until a big chain like 711 or Starbucks rents it. They still don't profit and just close the store but keep the rental because longer terms usually. Not sure why the banks have this incentive.
A pet shop in a strip mall closed a few years ago due to a rent increase. The spot has been empty since. I really think there needs to be some reverse market incentives. No tax breaks on empty space if you can't show you're making honest effort to rent it out, and progressively lowering the cost of rent to reflect the lower property value.
If it's actually a market, it should go up AND down. Otherwise it's just a scam.