Wish you provided the address and a snapshot of the buy and hold numbers. 

What is the fastest, most accurate, and most cost efficient way to get all of their phone numbers so I can market to them?

Before you know it, you'll be testing the paint for lead, the water for arsenic, the air for mold spores, pulling up the subfloor to determine the radon seepage, raking the yard looking for poisonous snakes and camped out with a flashlight and a machete in the yard in the dead of night warding off the threat of a zombie apocalypse while they chat up your other tenants into a class action suit to address your "negligence."

I recommend that you start at the Austin Zoning Map Address Search and then look up the zoning code for the city and your specific neighborhood.

Some states have specific laws around how much you can raise rent, so make sure you are acting within the law.After closing, introduce yourself to them, give them your address for sending in rent (or ask them to use online rent payment, whatever you're doing) and ask if there are any repairs that need to be done. 

I was not aware of that, and it could very well be true, but because this was not something we altered during the renovation, I don't feel it's our responsibility to address it now, after the home is sold.

It will result in better efficiencies and calmer feelings.

I was wondering if I can Infer about a property, Specify location ( not address)  talk about Price and ROI and no pics, and then have Interested investors DM me.

Then, regarding a total AP plan to address all 4 topics you need to protect against the Big 4 wealth destroyers.

I tell them I want to purchase the home at my neighbors address and they tell me I need to go through their REO department who 'have no phone number' and must be contacted by email.