Find the owner's information online and write them a letter. 

get a prequalification letter with a lender

If not, maybe ask for slightly more interest or fee, knowing that you'll have more time and cost involved if you have to take the property back.Is the buyer going to pay you monthly payments of 4166.66 for 24 months, or is this a smaller payment with a balloon? 

When you look at credit unions for these properties you are likely to see a 20 year amortization with a balloon payment at year 5 or 7.

Oh don’t say anything Negative cause you will get the message of eviction letter you can’t say anything negative or say there app is useless cause all hell will break loose  no joke  

That means shorter loan terms, higher qualification hurdles and floating rate or balloon components.Finding financing for multifamily properties in the 5-10 unit range typically means local banks and credit unions, or small balance commercial lenders.

I can connect you with some great local lenders if you would like.Once you have your pre-approval letter from a lender, you are ready to start house shopping. 

ORGANIZATIONAL DOCUMENTS ON THE BORROWING ENTITY: They will need* Filed Articles of Organization* EIN Letter from the IRS* The fully-executed Operating Agreement for the Entity (By Laws for a Corporation)* Meeting Minutes Showing the Signer has the Authority to Sign and that the project has been approved by the board of the entity. * Certificate of Good Standing for the Entity DRIVER’S LICENSES FOR EACH GUARANTOR: Please be sure to get a legible picture of the front and back of the document.

She has now sent me a letter threatening me with a lawsuit or I accept her "reasonable" offer of a 30% reduction in rent.

I would advise doing a Letter of Intent (LOI) instead of a Purchase Agreement (PA).