Also it would allow you to pick up properties that require rehab in your area of expertise that others might want to stay away from due to having to pay an external engineer to evaluate.

Major external obsolescence. 

As a consequence, we've had frozen pipes at three properties.At two of the properties, the cause has been water lines running too close to external {rubble} foundation walls and draughts coming trough the sills.  

None of the toxic fumes harsher products such as lye etc produces.The company that makes it sells other degreasing agents as well that maybe stronger.

You need to assess the long term effects of economics as well as other external scenarios like Climate Change.I'm not sure about Boca Raton or where you are planning on investing finally.Florida will deal with Rising Sea Levels, but 2017 was devastating in terms of Hurricanes.

Alternative options: Properties with garage apartments, accessory dwelling units, or possibly master suites that you could enter from an external door and just hole up without ever having to see the people you're renting rooms to.

For me, I use a variety of methods to help combat parties such as:> External video cameras>30 and older rule to book property and families only>No parties specific rule in contract along with maximum allowable persons in home at any time>Stay in touch with my neighbors so they can be my second set of eyes on the place>I use Evolve so they cover up to $3000 in any damage and they will go after the guest's credit card if further funds are required. 

BP mods will flag me if I post external links, but if you want the specific one that I used, feel free to PM me.

cashother assetsservicesare any existing contracts of either to be taken over by the joint venturewho actually does / will do whatWill any external funding be needed?

Duplex can mean more square footage than a SFH, so make sure to factor that in to rehab estimates (flooring costs, paint, etc).Make sure the current zoning permits multifamily units and some regulation change in the past doesn't preclude you turning it back into a duplex.Figure out with a contractor exactly what you need to do to turn it into a functional duplex - adding walls, closing off doors, adding external entrances, etc.