These accountants believe that purchasing from a related party is fine as long as it is an arms- length documented market-consistent transaction.   

The more challenging stipulation is you would need to use it more than 50% of the time for business use (and you need to log the miles to document that).  

The document you linked to is for NY State as a whole so that applies to Erie and Niagara counties.

And a reminder of our appraisal and rental documents for acquisition that everyone should have access to fill in and view when doing your research. 

If neither wants to sell you may consider putting everything into a jointly owned LLC with governing documents spelling all of this out. 

There are so many landlords that never update their lease or other documents.

It’s astounding how many fake documents are circulating today—you can find everything from fake references and stolen Social Security numbers to falsified income documents.To combat this, we rely on tools like Plaid, Verifast, and Snappt, which are excellent for verifying financial information and detecting fraudulent activity.

It also allows you to manage paperwork and document communications with Tenants. 

If they choose to dig in and fight, I watch them like a hawk and document every infraction until I have enough to get rid of them.

Quote from @Chris Seveney: @Charlene Kingsnorth have you had an sec attorney also review what you are doing as if you're are having multiple people as part of a loan participating in it depending on the state this could get you in hot water - so be careful  good point Chris some state allow fractionalized deed of Trust mortgages other do not or require PPM like documents prior to offering them..