To be brutally honest i don't care if it's at cost, below or above, I only care what it is exactly and how much. 

Is there any good rules of thumb to estimating the cost of a boiler?

These methods include: Detailed Engineering Cost ApproachDetailed Engineering Cost Estimate ApproachSurvey or Letter ApproachResidual Estimation ApproachSampling or Modeling ApproachExperience or “Rule of Thumb” ApproachIt’s important to understand the differences between the approaches including which one best fits your property and the reliability of each approach.DETAILED ENGINEERING COST APPROACHThis approach compiles the costs from construction and accounting reports to build a report.

.: First, I don't let them get a month behind on rent.

Properties typically on a land lease in communities like this are more difficult to get financing on - so not only check the values but also time it takes for these properties to sell to understand your holding costs

If....and this is a BIG if I know...the work was done to code, what could I reasonably expect it to cost for the inspections / rezoning process? 

However, I still struggle to understand the art of estimating rehab costs. 

And my experience was 18 months at best for term .. some went longer of course but many just went the first 12 months then moved and left a semi trashed house. 

Anyone have experience with a short term management company called BNB Monthly

Looking my insurance policy it mentions that I can opt for settlement under Actual Cash Value vs Replacement Cost.