Upstairs we have four children, who are quite rambunctious, so we will alert the new tenants to this fact, but are trying to lessen the impact of noise as much as we can.

For me the fact that I can buy a multi family on an fha loan with low money down, force the value, refi out of the fha to get rid of pmi all while keeping my low interest rate, and being able to have huge tax right offs against my rather high income, is a far better option for me.

First, it forces you to rely on others with no ability to go there on your own if something goes wrong.

Additionally a owners personal life events may also impact future sale price.

I think a lot of solar proponents miss some key elements when thinking about how solar can impact value.  

This will force you to decide when you will exit, or decide on an exit date you'll use for all your calcs, research the actual property apprciation trend, and rental increase history for you market.

I too believe that doing some research, finding the special deal and with forced appreciation, such as making improvements as you mentioned, can bring positive cash flow. 

I do not want to force a business relationship, I would rather enjoy calling and speaking with someone knowing that we both are looking to build together.

Don't force it!

What you pay for a house involves two parts,,,cash and leverage.The cash you pay must be recovered (through cash flow) before you start to make a profit.The leveraged part impacts your cash flow through the monthly payments on that leveraged amount.