You can always add features later.Regardless of what type of analysis you’re making (back of the napkin or full blown UW) always double and triple check your 1) exit cap; 2) rent growth; 3) property tax reassessment.Hope this helps! 

A quick back of the napkin says this is a deal worth pursuing tho: 19 x $245 x 12 months = $55,860 less expenses of 40% (estimated) = $33,516 NOI which should be more than adequate to service the debt, plus do some upgrades to the park.