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. 

Ok, I have read through the student loans posts and didn't see anything quite like our situation, so I figured I'd lay it out and see what you all thought.My wife and I have about $230K in combined student loan debt.

You will not be able to move those if you and/or your wife currently work for those employers.With a self-directed IRA, a strategy of combining funds belonging to you and your wife, for the purpose of flipping is very complex.  

Tax Liens are a good list, as well as combining other lists.  

One unit is delivered vacant and the other two combined are renting for $3900 (the realtor says the tenants are only paying out of pocket $28).

Domestic partners can combine their interests to achieve the required 10% or 25% interest in order to occupy a unit.The Ordinance generally permits the eviction of tenants from only one unit for the owner's use and occupancy.

FYI: I also run three of the largest real estate investor groups on LinkedIn with over 20,000 combined members.  

If we decide to make an offer, is it possible to either 1.) make the sellers put the full price of repairs in escrow (even though the other unit holders will benefit from the improvement); or 2.) make the offer contingent upon the condo association putting a certain dollar amount in escrow to handle the repairs; or 3.) do a combination of 1 and 2 saying that if all of the owners don't put a certain dollar amount in escrow by a certain date then the sellers pay the full amount of forfeit the deal?

@Wenhao Leu, I do plain 30 year fixed loans using combinations of subject property rental income, asset-depletion-as-income, and helping folks like you get honest with the IRS for a year, on a fairly regular basis.

They will find some other crap to spend the 20% on.