I've read that in Portland and Seattle, the market became so saturated with STRs that the prices fell significantly. 

Atlanta's market is great but a bit over saturated.

This particular property was renovated through the turnkey company and sold to a client 4 years ago.Before purchasing, I asked if the existing property management company would continue to manage the property and they said yes.6 days after I closed, I was told that they’d decided not to manage my property and I only found this out after I asked about prospective tenants.On top of that, the house needs repairs beyond what I initially thought.Has this happened to anyone?

@Peter Rigakos So the Tenant would be buying your property subject to the existing mortgage.

Solid home... new roof, plumbing... add existing tenant How did you find this deal and how did you negotiate it?

Oftentimes, the existence of a cloud on a title will permit the buyer the option to back out of a contract and often the cloud can be deleted easily by executing a document to show a debt had been paid or corrected.

We are a private lender that also buys existing mortgage notes - commercial only.  

I've been looking into investing out of state lately as the Atlanta market is becoming very saturated with buyers.

Last question is, can I sell one property, and leave the other property and existing mortgage in place?

Prior to its existence all agents technically represented the seller even when they were working with the buyer.