You find SFH investments where the down payment, closing costs, and holding costs will be sub 30k and then you have hope to net a cash on cash 100% return. 

If your PM can't do it for a cheap service visit then find a new PM.

How did you find this deal and how did you negotiate it?

Hello Carlos,I can help you analyze this deal, but you need go provide more info, what is the ARV, what is the purchase price, is it rent ready, are you going to have to do any rehab. 

Regarding resell value, it will depend on the market and if you can find someone willing to purchase for the price you're valuing the park at.

A simple one page option saying. 1) I understand because of your circumstances you’d like to lease  MTM.2) I don’t usually do MTM leases and it’s harder to lease my property in the “winter”3) because you’ve been such good tenants I’d be willing to make an exception for you at the rate of $x+$200 with the stipulation your provide more at least a 31 day notice to give me time to find a new tenant.

I get their auto generated number and match up against the comps provided with the paid subscription. 

I can place properties under contract but I can't find the financing, I have contractors who are ready to work, and a realtor to list.

I always try to use NNN when possible since it provides the most financial advantages for the owner and protects them from fluctuations in taxes and property insurance (which is a huge protection here in Texas). 

She did provide me with the property management company she rented from though.