This isn't gonna as precise as the comps the realtor sends you but in my napkin math, if I were the seller I'd do some fixing and shoot to list at $330K and hope I don't get any competition.

A quick back of the napkin way to check this is estimate the sum of the yearly rent premiums you can achieve by adding the amenities and apply a reasonable cap rate to get your value generated.  

Unless there's some reason not to (like if it's not sanitary or safe) buy used.

Like I said, I am just starting the research - call this the napkin.

And, I have an ongoing issue with the tennants flushing improper items down the toilet (tampons, sanitary napkins, baby wipes ect.).

I found this document related to PA:http://tenant.net/Other_Areas/Penn/harris/pa-part2...Two paragraphs appear to relate to this situation:Under the new "implied warranty of habitability" law, the tenant's obligation to pay rent and the landlord's obligation to maintain habitable (safe, sanitary and fit) premises depend upon each other.

Bill Robinson,You certainly don't need me to "run the numbers" or suggest the easy stuff, but my back of the napkin math putsyour current combined PI at about $575/month.

Nothing wrong with "napkin sketches" of what you are looking for in a floor plan arrangement or elevations.

I'm also working on developing an area between two subdivisions that involves redoing a lot of storm and sanitary sewer, water, bike paths, sidewalks, etc and installing a new road and light posts etc.

If it's in the wrong spot, if it's difficult to run pipe from your sanitary fixtures to it, then putting in that second bathroom (or a half bathroom) where you want it might go from being a simple enough job to being a glorious PITA.