Are there any investment funds that also use leverage (like from commercial lenders vice just accredited investors) so that I can multiply my investment faster?

During this time though interest rates have risen, which is putting a strain on this 10x gross multiplier.

They would just take the net income of the property and multiply it by the local CAP rate to come to an appraised value. 

So far, there are two quotes:.060 Reinforced EPDM for $10,500SBS Multi Ply System for $8,750Can someone with flat roof experience offer some guidance about the options the two quotes offer, and what should be taken into consideration when replacing flat roofs?

Maybe in a few months or years, things will settle down, but things are very difficult right now.So why not consider professional syndication investments.  6% CoC ; 2-2.5x multiplier; 20-22% total annualized returns.   

Grant Cardone wouldn't be pleased with that multiplier. 

Then use that percentage multiplied by your actual initial cost basis to determine the amount you paid for the land.

Lastly, I computed the cap rate by taking the monthly median rent, multiplying it by 12 and again by 50% (imputing 50 percent operating expense ratio).

Gross rent multiplier, gives you the front end.  

In case you didn’t know, the 1% rule tells investors to multiply the price they bought a real estate property, plus everything they’ve spent on repairs, by 1%.For a potential investment to pass the 1% rule, its monthly rent must be equal to or no less than 1% of the purchase price.