Thanks in advance  In my market you're only required to replace what is exposed.

Hey Will,As a PM in the area:-have a lawyer look over your lease-make sure EVERYTHING is in your lease (who replaces air filters, who replaces smoke detectors batteries, who cuts grass)-be thorough with background inspections-make sure tenant is aware (and is in lease) on when fines occur for late rent and how much they areThose are things that first come to mind.In can be expensive and time consuming to set it all up the first time and do it in a way that protects yourself and your investment.Let me know if I can help in any way!

Under contract in a 1031 exchange for two replacement properties, and also have another property on a hard money loan.

It would be cool to see things like this succeed and grow into things like multi-use developments grow up around modern mass transit access points.

You can only 1031 exchange long term rental "Investment Properties" and property that is used for business "Owner Occupied".However, since this is hypothetical, if the IRS allowed you to 1031 flip properties, then you would pay taxes at your capital gains rate (once you sold the last property and didn't replace it) on all the gain from all the properties and 25% on any depreciation taken during the the hold periods.

Looking for a contractor that can replace bathroom subfloor ASAP.

For example, after refinancing you find a lender with better rate, does this happen and do people replace the original mortgage with a newer one?

Maybe they are just trying to get everything replaced by complaining so that they never have to pay anything out of pocket. 

I'm not a flipper by any means so I don't know the ins and outs of foundation and framework if it needs to replaced every now and then.

Also it appears you need to have your evaporator coil replaced due to door missing and large gap at the base of coil box.