It seems you could simply answer, "I'm a real estate investor" or "I'm in real estate" and that would suffice.

The pros are that the rates are fixed for 30 years (as opposed to a 5 or 10 year balloon), loans slightly under $1,000,000 which are too small for agency are eligible, and your existing 1-4 unit experience would suffice.

Does the renters insurance suffice?  

Or would any budget furnace suffice in that situation? 

If you want to socialize with people who are interested in RE investing, these can suffice.  

Maybe a quit claim notarized would suffice?

I was stating that simply having a tenant sign an agreement/ waiver regarding the presence of lead would not suffice in Massachusetts.  

Any liquidity you maintain in the plan will suffice.  

If you only own a few properties then standard Fire Dwelling policy would suffice with liability coverage up too 500,000.

I would just figure being on the MLS would suffice , I know it posts to trulia and Zillow