Also, this tenant installed an unpermitted electrical panel.

4 glass fuse panelscloth & aluminum wrapped electrical wiringsome galvanized pipingmicrobial growth due to sitting for a whileThe Question:Is this still a good investment? 

i emailed him and explained that licensed gas tech ran 4 propane lines and he asked about any plumbing changes and electrical changes i said a licensed plumber a licensed electrician fixed broken things . now he is demanding a walk thru. i am seeking a lawyer. any recommendations?

Next phase is bugging you guys to help me navigate rehab phase but I look forward to it!!!

I am trying to figure out if I am leaving out an important metric or if this is a bug in the online software (huge disappointment if so).

It is home to two casinos, Electric Boat, a Navy Sub Base, and a National Guard Base, so the potential for future renters is promising. 

Can you either eliminate your common electric charges or even sell power back to the grid?

@Jorge Caceres If you have specific concerns with plumbing, roof or electrical you may want to consider calling around to local companies and have someone come out and give you an estimate on updating/replacing anything you are concerned about.

And make sure to account for the following expenses:1) Mortgage2) Mortgage insurance (PMI or MIP) or FHA Risk base3) Property Taxes4) City Taxes5) HOA (Home Owner’s Association) Dues and Fees and Assessments6) Insurance   a) Property Hazard Insurance (0.3-0.45%)   b) Flood Insurance   c) Earthquake Insurance   d) Umbrella Insurance7) Vacancy Rate (usually 8% - the equivalent to one month a year, or 5-6% if multifamily and/or if experienced, if not use 8%)8) Utilities (you’ll have these if your tenant is not covering them and/or during vacancy)   a) Water § Sewer § Garbage   b) Electricity   c) Natural Gas   d) Propane9) General Maintenance (usually 5%)   a) Upkeep § Landscaping   b) Snow removal   c) Repairs   d) New Appliances   e) Make ready10) Capital Expenditures (usually 5%, higher is the property is old and obsolete, less if fully rehabbed and all mechanicals and roof are new)11) Property Management (8%, even if you self manage, your time still has value and there might be a time when you'll want to be completely hands off or you'll not be able to do it, vacation, retirement, etc.), including...  

Look at your expenses and look at a way to offload them.  24 units and you are paying the electric, or water, etc i would look into implementing RUBS for billing.