On an individual property, cash flow is choppy like a bad one cylinder engine.

Interior is just framing, some plumbing, no electrical.  

Am a software engineer so I don't think developing would be an issue! 

Is it true that the bank would use the lot as collateral for a new construction loan @Troy Sheets Yes, the lot value as well as any soft costs like architecture, engineering, etc. can count as well with most banks.

A few electrical and plumbing issues were found during the inspection which again had to be repaired (payback for skipping on a good contractor) but we closed on-time and I was out of the deal.

Upgrading your electrical service to 200 amps doesn't really increase the value of your home, same as new windows.

By built correctly I am referring to SEO (search engine optimization), and the website programming.

We have had a Strctural Engineer out to the property and while we don't need to conduct repairs within the next 5 years or so, we will need to address both of these things at some point and it will likely cost us about 100k.Any advice on selling or holding for the long term?

electrical upgrades , plumbing,kitchen, roofing, shower, sewer,windows, doors, appliances.. plus I add the first 6month on the loan.My concern is that $18k as leftover in the escrow it should go back to the principal and I only  got  $15K the bank said that the rest is towards mortgage payments… ??? 

I don't use hospitable or any other combined booking engine other than VRBO and Airbnb.