It's critical to avoid a situation where you have just purchased a second property, put significant money down, and now have to pay for a new furnace ($10k in my area) at the first property. 

@Felipe Ocampo The critical step in the 1031 process is to contract with a Qualified Intermediary (QI), like @Bill Exeter or @Dave Foster before you close on your sale. 

Location for these types of properties is critical.

Every one of @Mike M.s criticisms are valid. 

Most people I’ve heard about open a special checking account specifically to track expenses, as record keeping is critical.  

Please feel free to add any additional context or suggestions, and let me know if I've missed any critical questions or considerations.

Of course the other massive difference is the diversity and size of employers in Chicago, which I think is absolutely critical to Detroit experiencing continued growth by drawing other industries to the city.Great thread 

We frequently run cabinets first in order to compress our critical path and get to countertop fabrication faster than if we waited on the floors, then did the cabinets, then did the countertops.

The addition of the word successful is critical. 

The remodeling work tends to overlap and phasing the work is critical to avoid additional work or delays.