What would you guys say is the rent premium for a newly constructed SFR compared to a similar home that has been recently remodeled but is otherwise say 40 years old?

What are the differences if any to Airbnb Write offs and tax benefits compared to traditional rental or small multifamily rental properties?

This has satisfied all lenders except for a home loan.  

And that being said, it also has different set of rules compared to non-historic properties, it seems.

Did you take any additional or modified screening steps with this tenant compared to another? 

As of 2019, jobs in Austin's tech industries totaled 161,433 or 15.8% of all jobs, compared to 8.7% nationally. 

For considering deals, your buyers are going to want to know stuff like repairs that need to be made, condition of major things such as roof/HVAC/plumbing, property ARV (After Repair Value), a few comparable properties for the ARV you came up with, and plenty of quality pictures of the property.

The way to determine rent is to compare your property to comparable properties and the rent those command. 

Getting your first rehab project will require you to create a SOW, talk to contractors, compare and review bid proposals, review budgets, & make countless trips to Home Depot.​You will inevitably make mistakes and underestimate things, but you will learn 90% of what you know by just doing your first rehab!

Rock on...there's nothing quite like responding to a tenant with a "well, on June 24th at 3:00, you confirmed that the repair was made and that you were satisfied with it."