That being said, it's tough to get over the relatively high rate of return for STRs when you are comparing them to LTR. 

Add a short statement at the end outlining whatever you are changing, have all parties date and sign, and you are done.Example: "Landlord and Tenant agree to extend this lease for an additional 12 months with a new termination date of 12/31/2025 and a new rent rate of $1,950.00 per month."

New construction may be an option, many builders are offering rate buy downs and closing cost assistance and then you get quicker appreciation when they continue to build out the community.

I'm looking for a PM group that has a reasonable monthly rate, manages tenant selection well, addresses property issues with quality, and conscientiously and actively turns properties when vacant. 

I never pay for the ticket and always crash the party heheUsually I have meetings in the lobby with folks that attend and network with others 😁See ya there (In the lobby lol)

Also, in our experience, 95+% of agents have no clue how to calculate ROI, Cash-on-Cash, Cap Rate, etc., so what are they really going to help an investor with?

It seems like you have a reasonable down payment available so offer them a reasonable interest rate. 

Take that amount, figure out the mortgage payment based on the interest rate. 

Then you can consider researching and finding something that meets your needs better. 

Not sure what the laws are in ME, but in Georgia a first position foreclosure will wipe out the 2nd position lien making them riskier which commands a higher interest rate percentage.