Do a deep dive on the property too, checking it's all clear to sell and there aren't any hidden surprises.

Instead of all 20 deep.

They did a deep review of my listing and called me back.

HUGE red flag. 

Not always, they go pretty deep on these.

Evan is right, I have been deep diving and analysing the STR market for a while now and you quickly come to realize that a decent home and location for LTR doesn't at all equate to a successful or profitable STR. 

Negotiating a security deposit amount is not a red flag for me, especially with over $10K in estimated moving expenses (professional movers) and move-in costs (1st month and security).

Austin has been a high growth city and likely is six to 12 months ahead in the business cycle as many smaller cities.Of those Three, San Antonio provides you the same legal backdrop (Tx) and also geographical access (same day drive) and accelerating immigrant population growth (GDP growth requires much more immigration both red/blue agree on this in private)

Further, my understanding is that it is possible to create a multi member LLC with yourself and a corporation as members, where you're the corporate official(s) - but we're getting fairly deep into the weeds here.Note that I'm just a lowly landlord who has attended seminars and implemented some of what was taught.

Unfortunately, you ignored multiple red flags during the vetting process and now you're paying a price.