BP has various tools to help you analyze your deals (rentals, flips, wholesale, etc). : https://www.biggerpockets.com/investment-calculators7.

It is hard to justify an expense that would eat up all of a majority of your cash-flow.An investor doesn't necessarily need 'any' professional but it really depends on your knowledge/amount of time you have.For example, technically, most people may not need a painter as the tools are available to them in Home Depot or most stores.

I truly believe the powers that be are trying to make the US into a renters nation. 

That's a powerful combo which could get you into a better space if the leaks are driving you mad!!

BP has various tools to help you analyze your deals (rentals, flips, wholesale, etc). : https://www.biggerpockets.com/investment-calculators7.

https://www.aier.org/article/the-perpetual-tragedy-of-new-yo...https://aoausa.com/the-destructive-power-of-rent-control-by-...At the very least, the concepts of rent control and "just cause" violate the 5th amendments' takings clause. 

need massive power close to said land.. also keep in mind they employ very few people so its not a long term thing for employment

BP has various tools to help you analyze your deals (rentals, flips, wholesale, etc). : https://www.biggerpockets.com/investment-calculators7.

Gas + convenience store, where the gas sales are mainly a tool to draw customers into the C-store. 

Tools like DealCheck, PropStream, and BiggerPockets Calculators can help with analysis.Good luck!