How Does One Pull Comps For Apartments, Multiunits, and Offic Buildings?

[Martin Manning]

I'm currently moving into the commercial world of real estate. I think that this niche pays off a little better than SFH's. I can find the deals through certain websites and other resources, but i hav barely a clue on how to actually pull the comps. I mean, is it as simple as finding a few recent sales within a few miles on zillow or is it as complicated as finding a commercial RE agent who I'd have to pay to give me a CMA? Is the term CMA different for commercial? How would I find comps for other commercial properties like gas stations and hotels? Do I just have to go by the actual numbers like revenue from last owner and taxes? I just need to be pointed in the right direction because I get deals in my inbox from people I communicate with all over the country.