Also, confirm market rents support your investment.

How will the new administration effect RE market in overall US market. 

It sounds like your current property manager may not be marketing the rental effectively, and the fact that it's listed incorrectly as an apartment instead of a duplex could be turning off potential renters.

Warn them in the marketing (example: "This is an old house and noise travels between units.

I, too, am in Tampa and I've been a lender/banker and a Real Estate investor in the market since 1996.

I.E. you know the area better than others.Is there a short-term rental market where you vacation at, where you went to college or where you grew up in?

I won't be out-marketing anyone. 

I don't think either Southlake or Frisco are good rental markets. 

Most brokerages will pay around 25% of their commission when you refer a buyer/seller.

I also have multiple tenants in the Ohio market that are part of the voucher program (CMHA & Eden).