I built high-end custom modular (e.g. stick built in a factory and shipped) for a significantly cheaper cost per sq foot than it would have cost to build with a local builder.

Call your friendly local appraiser.

This means not only mapping the location of your existing utilities, but engaging with an experienced provider who knows how to work with your local utilities.

Hi Flavia, Research the local market trends, economic indicators, job growth, and development plans in the area to gauge its long-term potential.

In all cases I will show the benefit of time on local RE investments (even those purchased at full retail).  

Hi  Nyron,I am local to the area and have a lot of connections.

Declining local economies invariably hurt home values.

If you decide to further pursue this one you need a local structural engineer who can assess the already completed fix.

Utilities, taxes (property, local vacation, & income), landscaping, furnishing / decorations / amenities, pest control, & supplies (soap, TP, etc) are the big ones on my STR calculator that you didn't mention.I'd also recommend using the enemy method to determine expected income.

Partner with a local lender.