I am a software engineer so I prioritize partnering with the right team to execute every steps of investing.

This is calculated after accounting for all expenses, including taxes, insurance, utilities (water, sewer, garbage, electric, gas), and an allowance for maintenance costs (typically 5% of gross rent, adjustable based on the building's condition), as well as management fees.I invest in the Binghamton, NY area both as an investor and as a realtor.

Did nobody ever stop and say "oh, hey, maybe we should keep water pumps going because, ya know, no electricity no water pumping, NO WATER". 

Support your application with comprehensive documentation, such as a licensed architect or engineer who might have to approve your plan.

Smart investors first focus on finding quality properties—such as those in thriving areas of Brooklyn or potential neighborhoods around Manhattan—and then reverse engineer the process by improving management, optimizing rental structures, or enhancing facilities to make it worthwhile.

Why pay rent when your landlord gives you free housing, free maintenance team, free mortgage, free electricity, free water, free trash?

This unit was gutted down to the studs so there is all new electrical, plumbing, windows, sheetrock and finishes.

Is it possible for her to buy the house/land then we subdivide the property (property has an approved preliminary plat for subdivision into 2-3 separate lots, electrical and pluming lines have been put in place for future development).

Nobody should be surprised, we literally social-engineered this. 

since as part of the project you are going to need an architect and civil engineer, I recommend starting with them and ask them who they have worked with for zoning.