likely going to be a bit too small ($ size) for most DSCR Lenders that do Mixed Use unfortunately

The insurance premium should be probably be prorated based on in-service date and only expense out that portion. 

If so, I think buying a single family home and renting out a portion of it to airbnb or a long term renter.

Lol, I have a similar story but I got off easy....I had my guys digging footings for a remodel in a little SoCal beach town when we found bones - some good sized ones.

If they do not pay their portion (if they have one) you say, " hey you are breaking the rules of your program, if you do not pay you will " lose your free ride ". watch how fast they pay.

I just spoke with paperstac guys today and they also are doing closings now for investor transactions - so if you want to close on a note that you do not know the seller they will handle the escrow transaction portion.

So, size, location and theming to answer your question.

You will also face depreciation recapture tax on the portion of depreciation claimed while leasing the property.

Use both, square footage year built , lot size,  upgraded which year etc

This can be fairly straightforward, depending on your agreement and if a partnership return was ever filed, you'll want to report half or your portion of the basis in the property as well as half the sale price minus expenses.