I won't just write them all here but I highly recommend contacting a qualified 1031 intermediary to walk you through the process.

Quote from @Theresa Harris: Get it in writing, change the locks, get the place listed and find new tenants. 

Fees should be clearly stated in writing, easy to understand, and justifiable.

Fire marshall should have provided something in writing to you either a list of what needs to be done or reference a code.

Quote from @Matt Levine: Hey @Benjamin Carver, thanks for the write up.

Fees should be clearly stated in writing, easy to understand, and justifiable.

I am considering doing this but should I charge a fee to write up and get the lease addendum signed?

Buffalo changes very quickly block to block (not just ZIP by ZIP) and it is crucial that you understand this prior to writing any checks. 

This is obviously much better than $1,400 per month.On top of that, you will now get 2x the depreciation write-off so your taxes should go down.On top of that, you will now get 2x the appreciation when real estate price go up.On top of that, your tenants are helping you pay down the loan, initially at about $100/mo for both properties, which gradually gets better and better.On top of that, you now have more units so if one or two goes vacant, you have more renters covering the losses of the vacant units.If you want to keep these properties, I would do a cash-out refi and go buy more rental real estate.

Now this is an annual thing (for all new properties).For rough math, you can generate a tax write off about 15-20% of the real estate value: one a million you can expect a $150k to 200k write-offs.