If you definitely want to find Airbnb owners, then go on Airbnb, try to figure out the address of the property you are interested in and mail an inquiry to that property or look up the owner's mailing address (that is possible here in Florida via public records) and mail them a professionally sounding and respectful inquiry into purchasing their property (preferably without the word "unload" in it, lol).Good luck!

Should I really keep all these years of tax records?

The window is up to the code, but there was no record that the previous owner has a permit when the window was installed. how can I start to get a permit?

Blake yes In Pennsylvania a property management company needs to operate under a licensed Broker of Record.

your mom can probably confirm, but I don’t think Alameda County is even recording deeds right now 

I think this is why things like Zillow Offers works just fine in certain markets with large subdivisions of the same house built over and over, and you are simply looking at sales data from public record. 

It is the county record office that is king.

I am having a virtual tour recorded tomorrow. 

(See below from New Jersey Realtors)I just recorded a video walkthru on a listing where Seller is not residing right now.

@John Lewis, beside hiring a surveyor you may be able to pull the original blueprint from the record of deeds.