If examples are presented keep asking for explanations until you know exactly what was done and why.When my kids were in college and had no idea what they wanted to do after graduation, I suggested they look at the Sunday newspaper Employment Display ads section. 

I don't know how to properly do the 'quoting' on this site but here's a few notable ones from Liesl:Jim,Thanks for sending the additional context for your question.

Tons of entertaining space in the basement in addition to the 5th bedroom and full bath.

Additionally I am reading and researching 2 hours per day about real estate  rehab costs, plus other related topics. 

Robert Clement - Does your lease have late fees listed as additional rent?

But you have to have something to show/fax previous landlords and employers anyway so I stick with hard copies. 

In addition, as you have alluded to these are often illegal units which means they will not be worth anything on the resale.

Additional questions to ask?

If so, the additional accounting cost per LLC can be very, very low provided that you are doing the basic bookkeeping yourself and passing off to a CPA at tax time.

Do I go back with additional estimates and try to get the 20k difference off our handshake agreement?