Home owners have installed new sub floor, new electrical, PEX water lines.

For example if you want to swim you can read analyze and watch others but the real education is when you are in the water.

The tenants are responsible for common area maintenance, water and garbage. 

The tenants are responsible for common area maintenance, water and garbage. 

Well, Just like many other homes affected by the freeze in our area, every water pipe in our house burst, causing ten's of thousands of dollars in damages.

Only issue is if you want to sell while construction is going on it might deter a lot of buyers (and renters)The duplex I sold IF I had decided to keep it I probably would have looked at converting it back to a triplex (its configuration probably from about WW2 through early 2000's)  - I would have needed to basically replace a couple walls,   modernize the heating system,   add a third and maybe 4th common electric meter,  and find somewhere (probably a shed) for a common W/D and locate a 3rd/4th water heater.    

Like many homes in our area, our water pipes burst, causing ten's of thousands of dollars in damages.

While I’m in the real estate business as a residential agent, I feel a bit like a fish out of water with multi-family.The main question I have at this point is this: what documents should I be getting from the seller that pertain to the property during this DD period?

They didnt disclose the private water and sewer utility charge.

Pretty much seems to sums it up.A hammer + a nail punch and some tub and tile sealant might work.You don't want water getting under there.Good Luck!