Very good in some places, and very poor in others. You have to know the area market and the "craft"of rental investment real estate, or obtain the benefits and services of a seasoned professional real estate agent who's counsel you trust. Preferably, go with someone who puts his money where his mouth is -- someone who also invests in the market where you're looking to invest rather than someone who's just there to make a buck -- the proverbial agent who'll let you buy anything so long as there's a commission in it for him.
I would relish the opportunity to speak with you about rental investing in San Antonio. There are so many subjects we can talk about from prospecting for properties, rehabbing, the various methods & tools to ascertain return on investment, landlording in Texas, iron-clad leases, etc...
Mike Anthony, REALTOR
RE/MAX North - San Antonio