Currently I'm amortizing 750$/month of principal, which will grow over time.I have two other rental properties with positive cashflow of 200$ each.What considerations should I take when checking if I want to prepay the mortgage on my negative cash flow property?

@Nick McBrideFirst you have to determine what is your responsibilities of paying and what is the tenants responsibilities of paying.As a general rule - the landlord's expenses/allowance will include repairs/capital expenditures/vacancy/property taxes/mortgage interest/mortgage principal/etcDepending on the county - Water and Sewer can be included in property taxes and be the responsibility of the landlord.Items such as electricity/water/gas is up for negotiation to be paid by either the landlord or tenant depending on what is said in the lease.

POHs is counter to the entire principal/advantages of owning parks.

You can offer them the tax depreciation (payable annually), the principal reduction (payed when you sell or refi), the cashflow, or the appreciation.

Even a quick ballpark of the numbers they were giving her meant a payback period of almost a decade without the NPV factored in.I told her not to do it.It would make more sense to take that 5K "closing cost" and drop it into paying off the current note's principal.

It has been on the market for 134 days, so I may be able to negotiate a lower price if the seller is motivated.My down payment is 3%, and closing costs will be factored into the mortgage.The amount for principal, interest, property taxes, insurance, and mortgage insurance is around $740-$760/month.

I currently own a property that has two rentals on it with a principal mortgage of $2650 and a Heloc for $550 a month.

If not paid in 3 years then required $15k additional towards the principal at that time.Value unknown as appraisal isn't required.

However, there's a principal agent / personal exposure problem with that, not to mention the impact on your investment returns/bottom line even in a best case.Reputable turnkey companies - well - some on these forums will recommend them, and some on these forums have also had some success doing out of area investing.The trick, though - is volume. 

And, I'm aware that the more I can put towards principal now the less interest I will pay, but I really cant swing too much more in monthly payments.