Pull records and permits from the city/county. 

If you are going to go heavy into real estate investing, there are many ways to defer taxes, so losing the personal residence deduction may not be an issue.

@Thomas Rutkowski, You also state "...And because of the fact that it is done through a qualified intermediary, the depreciation recapture is deferred for the same reason that it is in a 1031 exchange.Readers should take note that the California Franchise Tax Board has issued negative guidance regarding using the Deferred Sales Trust, Monetized Installment Sale or other installment sales techniques to "save" a failed 1031 Exchange. 

Sounds like a whole lot of issues over nothing as someone with 45 units blinds and a few holes are the least of your worries the turn over and vacancy cost to replace a tenant would far exceed some minor miscellaneous cosmetics.

Make sure that it either was added with permit or is not counted in the footage.- hardscape is expensive.  

For example, the city of Palm Springs has a hard-limit on the number of STR rental permits it allows (and it has a huge "wait list").   

Airbnb has told me if there is an issue when they leave I have to fill out their form to see if I can get reimbursed.

i have great cleaners, no issues with reviews for the year.

It would be great to hear from a wide variety of folks on what issues they face, processes that slow them down, or any other problems that if they were automated, they would benefit greatly from.More than happy to provide insight into these areas.

You can find the best cash flow in areas that are hard to be a landlord and on homes that have deferred maintenance and tenant issues so that should not be your main focus.