This book was released in 2019 but I found it to contain a lot of great information on voucher programs.https://www.amazon.com/Subsidized-Comprehensive-Government-F...

Based on the value of a property you can likely get away with a inexpensive desk top study such as condos and you will require a more comprehensive engineering study for larger properties like a 4plex.Desktop / modeling options are sometimes good for smaller residential like you mention. 

Hello, you can do some research with the city's planning department as far as their development standards for that zoning, i.e. set-backs, height, lot coverage, etc.

I've been using Avail to generate leases and collect payments from guests for my MTR but I don't think it has comprehensive enough features. 

MANY policies are explicitly excluding mold from coverage.

Make sure you’re checking in on your tenants, getting them to document any damage, and having solid insurance coverage.

I figure my options are to sell and take a loss (not ideal), or preferably find coverage that allows or doesn't care about the K&T.

When you find out the present zoning of the property, the future land use and the local agencies comprehensive plan for how they see the area being developed (all can be done at the local planning office) you will have a much better idea of what you have just bought.If the land could in any way be developed into something more than single family residential lots, i.e. if there is any multi-family or commercial component than I would advise you to hire someone qualified to help you with the site planning of the development.

DSCR (Debt Service Coverage Ratio) loans are often used in real estate financing, particularly for investment properties.

In my experience, cash flow is key, especially for long-term holds, so running a detailed DSCR (Debt Service Coverage Ratio) analysis might be a good step here.On the flip side, if you're eyeing faster returns, a flip might be more lucrative.