I have an ADU on my property and we have been performing well. 

Hvac, Insinkerator, furnace, water heater, toilet, fiberglass tub, roof, driveway, etc...Here's a link: https://www.hud.gov/sites/documents/EUL_FOR_CNA_E_TOOL.PDF You might also want to consider a home inspection for each unit with a written report, and a sewer cam report.Good Luck!

The short term rental market is alive and well, I am performing better this year than last with no changes in my management.

We have 45 RV slots on site.

@Patrick Gray, The first question to ask is if those properties are performing the way you want. 

The asset manager who trusted us to get their BFR communities back on track and performing through hard work and determination. 6.

However, I am not sure how the property would perform as an MTR.

You can still depreciate the property, perform a cost segregation study if applicable, and deduct ordinary and necessary expenses related to being a landlord.

What adds value is the sewer/septic, water and electric at the site.

I don't want to sell because I buy properties that perform that I like.