They may have design specifications they require or personal branding restrictions. 

The only caveat being that the houses needed to comply with FEMA Elevation Restrictions within 3 years, otherwise control of these properties would revert back to NYS.

Takoma Park has some, but with incredibly restrictive rent control that almost guarantees theirs will be cash flow negative.If you want to invest in the DC area I highly suggest not getting too enthralled with 2 to 4 unit properties.

And, your income is also restricted by being a service provider rather than an owner, your service isn't legally worth whatever you can get in real estate as if you were selling shoes, the difference in real and personal property and fair pricing of services comes into play as well.

With these two restrictions I believe my only option would be a hard money or private mortgage at this point.

In Miami Beach, the zoning restrictions make it very hard to do vacation rentals, it depends on the zoning, location, etc.

All you have as the auction winner is the legal right to the unit - meaning you can rent it so longs as the HOA has no rental or investor restrictions! 

If you live in a Deed Restricted neighborhood, you are at the mercy of your HOA?

Why restrict yourself and team?  

Davidson County has restrictions on that, but I don't think they apply if you rent only a portion of the home.