I am considering doing this but should I charge a fee to write up and get the lease addendum signed?

Your life style has lead you to this situation and you must change your lifestyle in order to be successful with real estate. 

I work with a lot of MTR investors and what I am seeing frequently with multifamily acquisitions, particularly with new investors, is that they often test the property just like you're mentioning, as a way to dip their toes in the water and see what works in their area and for their personal style.

@Rene Hosman The only time I've seen them is larger buildings that have financing and the success of the project is contingent on a certain occupancy number, but then again what project isn't :) That being said, I'd always write concessions to start on the second month of full rent.

I'd recommend interviewing multiple PM's and seeing which one fits your style and expectations.

Now this is an annual thing (for all new properties).For rough math, you can generate a tax write off about 15-20% of the real estate value: one a million you can expect a $150k to 200k write-offs.

I'm just going to write up an addendum to terminate these addendums. 

Also I am highly suspect of a company that would use an endorsement on their hope page of the controversial author Regina Jackson, whose claim to fame is hosting expensive workshops and writing books that claim all white people are racists. 

I think the A frame idea works great for this setting, but some have said the A frame style steeper peaked roof works better. https://www.instagram.com/redtail_cabins_adu/

You would need to notify them in writing that you will not be expending their lease and they will not be transitioning to a month-to-month lease.