We have already tried to get the neighbor's signature but he says he will only sign if we write a letter signing we will never make the house a business.

And here is the letter from my lawyer saying you are responsible for all of my hospital bills as well as my workmans comp payments seeing that I was an employee of yours cutting the grass for your rental proerties.Oh, you have insurance.

I would first send a letter to ALL (dont send out the letters selectively) the tenants with an excerpt from the lease contract regarding tenants liable for their guests actions. 

I then assigned each cost with a letter and number.

If you think sending out 200 letters once with no follow-up and no second, third, or fourth touch, then the answer is no.

Once it turns into a partial rental, it does allow for at least a partial deduction of interest against rental income depending on the mix of use between personal and rental.

When I am ready to, I plan on driving for dollars and using yellow letters sent to absentee owners. 

Moving forward I will not be mixing business with family and friends, but for this property, I want to do what’s best for everyone involved.

Our next plan is to write her a letter.

Stay healthy, stay away from bad people.Some ideas to find the deals:walk/drive neighborhoods, look for neglected propertiesadvertise, newspapers, radio, pass out flyersWrite a nice letter to landlordsWhen housing court starts up again, meet landlords there - chatCall and visit owners of Expired Listings - make offersBuild a relationship with a few Realtors, offer to pay them a fee (3-5% of purchase price for unlisted buildings) for presenting your offers to FSBO's and expired listings (auto pilot investing) The purpose behind this is to open negotiations with sellers, I always offer well below their asking price BUT IN WRITING hand delivered by an agent (you save time, cost of gas and you increase the odds of finding a fat equity deal)Study Real Estate Control techniques; delayed settlement, assignment clauses, all types of options, hybrid or JV with sellers, repair consideration with possession (known as front porch offers) use one of the 21 proposals for seller financing (the best highest leverage financing you can get)My LOCK-DOWN has proven to be profitable, I have time to network and develop clients nationwide to mentor/partner transactions.