But here's the problem: they all concern historical buildings (I invest in Europe, ancient cities like Maastricht and Liège).These will require a lot of renovations to get them up to speed with the new EU energy-efficient requirements and such.

I liked his methodology and that he was very conservative, but he seemed leery of using incoming rent as part of my income.

From a methodology perspective, I'm using the relevant fields of 362,386 county property card records in a series of queries to obtain the results.

The reason being that the houses were older than I'm accustomed to and they use different building methodologies up there, so I wasn't able to assess things like the well, foundations on clay soil, rubber roofs, etc.FWIW, I was over budget by about $25K on the first Milwaukee rehab -- about $10K of that was stuff a really good inspector probably could have caught (structural/framing issues), but the inspector missed it and so did I.

From that information you could devise your own methodology for determining comps.

Being an engineer myself i know the terminology and methodology, and if youve never dealt with that before you would likely be shocked by required support especially if you have snow loads in your area.

Ultimately, per @Christopher Phillips link, the residual land value analysis is the preferred methodology.

.*: Styx - from ancient Greek mythology, the river running along the border between the world of the living and the world of the dead ("the underworld", Hades, etc.).

Both heating units were ancient; in fact, the first floor unit was being heated by the original boiler, which belonged in a museum.

I would also reach out to all the parks locally and find out if they are including water  and/or seeing what methodology they use before moving forward with a decision.