Week or two later I've got a letter in the mailbox containing my rental license application, check, and a notice informing me that my duplex was a single family residence.Imagine my surprise.

Also, I own a roll off container company and he is my partner in that business as well so you should be able to save a few bucks there as well.

I'd love to explore ideas about container homes or container apartment complexes.

A consultation with an experienced syndication attorney can usually place you on the right track and help you figure out what will work for your deal, while containing costs to the extent possible. 

@James RouxThe image you posted contains personally identifiable information (their names).

Is there a limit on the number of properties an LLC can contain?

What about the following clause in the MA Legislature (the last paragraph seems to imply that I can only inspect it within the last 30 days of their lease, doesn't seem like I can do regular 6-month inspections):Section 15B. (1) (a) No lease relating to residential real property shall contain a provision that a lessor may, except to inspect the premises, to make repairs thereto or to show the same to a prospective tenant, purchaser, mortgagee or its agents, enter the premises before the termination date of such lease.

Perusing through my broker's policy manual, it does say that all advertisements must be approved by the company, are owned by the company, and must contain a keyword disclosing that you are real estate professional (e.g., broker, agent, etc.). 

The sad part is the Agent was the Owner and attested one laundry room converted to an un-permitted 'unit', containing 1bed/1ba, no kitchen and a known illegal immigrant in residence, cash rents under the table.   

I recently sold 2 that were older than 1976.1968 2 bed/1 bath for $24,9001970 2 bed/1 bath for $28,000In some areas, you may need to upgrade the home to local code standards.1 - Sheetrock around heater and hot water heater and within 6 inches of cook top.2 - Egress (escape) windows in bedrooms.3 - Electrical - older than 1976 may have aluminum wiring instead of copper and pugs and switches may need to be upgraded.4 - Linoleum may contain asbestos and might need to be removed.Hope all this is clear.