Price Per Unit (PPU) and Gross Rent Multiplier (GRM)PPU=Price/Number of units-PPU is used to give the cost of each unit within a property.

Would you just get him an offer ASAP, based only on Gross Rent Multiplier?

Then multiply this by the number of properties that you want to own and then divide by the amount of time you want to achieve this in.

The sale price was $430,000 ($53,750 Per unit, 7.66 Cap Rate and a Gross Rent Multiplier of 13.04).

If so then let's take $1300 X 12 = $15,600  $80,000 normal sales price, divided by $15,600 =5.1 gross rent multiplier. 

A lot of people put on a realtor's hat to sell or list but have no clue about CAP rates or Gross Rent Multipliers or other valuation methods.

Today, properties are selling at a cap rate of 2-3% and gross rent multipliers of 15 to 16 and above.

I pull equity out of some of my rentals to multiply my cash flow with cash out refis.

If you have a roof with more than one layer of shingles, add about $40-50 per square for demo and haul-away.I'd be willing to bet that on a 1700 square foot house, you're probably looking at 20-25 squares, depending on how many stories and the layout.While it's tough to estimate from the ground, you can try multiplying the length by the depth of the house to get a square footage footprint, and then for a typically pitched roof, add about 40-50%.Though, like others said, get a few bids and you'll quickly learn how to estimate for yourself in the future.

This number is multiplied by the number of sections to give the area per radiator then multiplied by the number of radiators for the total sq footage of steam required.