Never use a seller's numbers, yours will likely be different, if nothing else, by inflationary costs, taxes go up, insurance goes up, utilities will go up or the usage won't be identical, some seller's numbers put you in a ball park, usually in the parking lot, not at home plate.

I'm glad for Brandon's success n his style runs nearly identical to my developing plan, we just have a differing end goal (if i'm correct.)

Focus on what is motivating you to move two doors down to a nearly identical row house to the one you live in now.Go!

But, I saw an identical unit with the same floor plan in the same complex on Craigslist rent for $2750 so I figure the market rent is about $2750.

Earlier in 2018, a nearly identical lot (next to next property on the same street) sold by original developer of the subdivision and I guess because it was not listed on MLS, the transaction info is not present there.

They should have been vetted via identical criteria.

If you have existing tenants, be sure to document their identity and employment information in case you need it.  

A model match 2 houses down went for $420k 6 months ago, better condition in terms of paint and landscaping but identical builder grade finishes.A house right around the corner just hit the market at $560k, remodeled, and went under contract in 3 days.

Identical offers except one is FHA and the other is USDA.     

Say you have two triplexes that are identical in most every respect, except one rents for $500 per unit and the other rents for $600.