@Leland S.This is going to be very costly and the issue it is not resolving is vibratory noiseHaving built many building there is sound and vibration transmission - you can dampen the sound (again costly) but if it’s hardwood floors or a kid above it’s not going to stop the pounding / jumping .Is this a real issue brought by the tenant?

The issue with RUBS is that it is fluid and it hinges on the # of occupants and this poses issues: 1) A child uses less than an adult; 2) a worker from home uses more than one that drives to work; 3) A couple may have a child during tenancy which they fail to divulge; 4) friends and family may visit for a few days during holidays.... etc. etc. etc.  --- and... these issues become issues for the other Tenant and then turns you into the constant 'utility police' because you constantly have to monitor # of occupants... eww. 50/50 is simple and simply understood and 100% while vacant is also simply understood.

With all that being said, you can still pay a 30 year mortgage off in 15 years, not be tied behind a higher payment, and still keep your debt to income ratio fluid.

I don't waive it, even if Aunt Gertrude died, the transmission fell out of the car, and they had quadruplets on Saturday.3.

Great thing about being cash fluid is you can buy a 2-4 unit that may need a little TLC and do some renovations.

Being that it also can earn interest and act as collateral also positions it beyond just the money transmission utilty it appears.

It's fluid. 

@Steve Garner,I agree, it just seems like it would be a more fluid process to just get the deal done, rehabbed, rented and worry about the refinance later? 

I had an old Grand Marquis that I rebuilt the suspension, brake system, and replaced the entire transmission in the parking lot outside my apartment.

If you have the money, i would do that plus add a metal z channel going opposite direction of the joists ( screwed on top of the existing plaster ) and then add another layer of drywall. the Z channel leaves a space that helps in sound transmission. the problem is the sound is transmitted through the existing floor joists too, so just the insulation will not do it because the joists are still against the ceiling. this is something similar, but in this picture they used clips in combination to hold off hat channel from the existing ceiling which will lower your ceiling about another inch.