I have since learned that I can not expect to get any kind of cooperating brokerage commission from a commercial listing agent unless he or she is desperate for a buyer.

Ask an agent friend what the prevailing rate is for a cooperating broker who brings a tenant in your area.  

What can I do if he is not cooperative or wants a large amount to buy him out?

Thus, the buyer must agree in advance to cooperate with the seller should the first trust deed be called due and it becomes necessary to refinance the real estate to fund a payoff of the first trust deed.If possible, prior arrangements should be made with senior lenders to prevent due-on enforcement during the term of the AITD, sometimes called a reverse assumption.

https://www.nolo.com/legal-encyclopedia/overview-landlord-tenant-laws-massachusetts.htmlhttps://www.mass.gov/guides/the-attorney-generals-guide-to-landlord-and-tenant-rightsIf the tenant does not want to cooperate, contact a lawyer immediately to find out how to proceed.

@Jake Cooper,One of the biggest challenges you're going to face is finding the right properties. 

Some tenants has not be very cooperative.

Sure, there technically are still days left... but she is not cooperating, and I need to prepare for worst casehelp-- i have to clean up my mother's mess!

I would ask them to cooperate and maybe offer an incentive for them to do so, but at the end of the day I am sure your lease says that they have to cooperate. 

I want to cooperate, but I really don't want someone popping by in, say, March.2.