My only tool for figuring out the mortgage has been multiply calculators for this found online, but all of my estimates are about 1500 (at an interest rate of 5%) for with a 40k down payment for a 250k property.

For those who want to cash out of their asset for long-term care of a parent or to divest the profit before family members multiply due to the death of a principal, understand that a specialist in this sector can best help you determine value--the friend or relative who dabbles in property management and residential sales probably won't be able to best advise you in your next course of action.

GRM stands for Gross Rent Multiple.Gross Rent Multiplier is the number of years the property would take to pay for itself in gross received rent.  100,000 sales price / 15,000 gross rent = 6.67 GRMDSCR = Debt Service Coverage Ratio.Is a calculation used by mostly banks, that tracks your ability to service the monthly payments on the debt

In reality this would be lower because there are other monthly expenses.You have to know what the other expenses are per month to determine both the capitalization rate [yearly NET income / building cost ] and gross rate multiplier [Cost / Gross Rent per year].

@Bob BowlingI will still always look at the rent to price ratios or lets just call it the gross rent multiplier  since that is what it is.

Most of the investors I work with look for around 100 gross rent multiplier (GRM) or less, some 110 depending on area. 

NADA just has a spreadsheet that takes last year's value of the home, and multiplies by .97 (or so) to come up with the value of the home this year.So that's why I say I don't like/trust NADA values.  

The problems usually come when the droppings are in contact with soil and moisture so that the fungi can grow and multiply.

I know that @Bob Green has posted recently about credit lines that they offer with as little as 10-20% down and a 5x multiplier.

Next, decide if the city (where the subject property is located) is very competitive with a lot of investorsmaking offers; or, an ideal market where there are many potential deals with few investors making offers.Next: In a competitive market, you may want to multiply FMV by .70 or .80, then subtract rehab costs, along with the amount you want to make.