Building Codes are not equal across the country and some of the newer rules are quite over the top......so he may be charging you for extra work as well.?

the bed bug ordinance went into effect January 1, 2021 - see link below.https://codelibrary.amlegal.com/codes/philadelphia/latest/philadelphia_pa/0-0-0-198057 

Do be careful though and check with your city's zoning and development codes.

You may have old sewer lines, old wiring, asbestos, lead paint, rubble foundations and various things that fall short of modern code.

Read the zoning code, and if it's not crystal clear call the powers that be.

However, the information for Box 20, code V lists a high dollar amount and that is what I've been told is the line for UBTI.  

Small repairs, correcting code violation issues with the city and working with the current tenant to get on time payment.

MF 1 MF 2but as noted again above just go to a smaller jurisdiction get on line with their planning department and start reading the code.  

$5,500 is probably two years of your cash flow. i will second and third the gravel recommendations. had a 10 ton gravel dump truck show up for $500 before, so unless that's against the city code, i'd go that route instead.  

Also ask them if you would be allowed to build driveways out to that resort road.Lastly you will also want to check building codes to see if boat storage or any of your other ideas would even be allowed.The other thought I would consider if this is a resort area is Airbnb the log cabin.