I the understand the wiring for this specific purpose equipment can be considered with the tangible property. 

Another consideration which applies only to electric is access to the load center.

This protects against potential claims and liabilities specific to the rental.For tax purposes, maintain clear records of rental-related income and expenses, allowing deductions for insurance, utilities, maintenance, and depreciation proportionate to the rental unit.

They are a new international lender in Costa Rica offering 30 year, fixed rate mortgage loans specifically for American investors.

In that case, you’d typically need to file a legal challenge, which could involve going to court and showing that the restriction is unnecessary or unreasonable.The best advice I can give would be to consult a real estate attorney to understand your specific situation and options.

Specifically, what research results told you these were two good cities to invest in?  

While I do take into consideration all the relevant expenses when I vet a property I still like to see at least $200/door cash flow so I can more easily build up my reserves and have some money to work with.  

Specifically, I am looking at partnering with an individual who owns securities (stock and mutual funds) having them take out a line of credit against their portfolio (SBLOC) at a low interest rate, and using that to purchase properties rather than using a mortgage.

lots to learn here just browse around and you'll pick up on stuff and know where to hone in more im specific areas you are interested in. 

That said, Detroit is very much a block-by-block market, so understanding the dynamics of specific areas is critical.For professional investors (and even newer ones), Detroit’s future is bright if you approach it with the right strategy, solid due diligence, and an understanding of the challenges.