With an LTV, it's pretty cut and dry, but there are many ways you can calculate DTI, so I think it's going to cause a stir.

One corner isn’t being supported properly and is sinking, the floor boards are separated way too far apart, joists/beams are rotting, and a few other issues.

What if you are mid-flip and the market drops 10% or rates increase and the buyer pool dries up? 

Remove floor; mop subfloor with water/bleach mix, let dry, 2 coats of Kiltz, 2 coats of poly sealant.

I use low cost Home Depot vinyl laminate everywhere if sub-floors are smoothI use low cost Lowes wood laminate in dry areas if sub-floors are not completely smooth.Best, Terrell

However, the financing dried up on those in the early 2000s.

More complex deals can certainly take longer, but the cut and dry ones where its just multifamily sales are fairly straightforward if the seller is adequately prepared and has the information readily available.  

The market has simply dried up. 

However that can be fixed by drilling a pattern of holes, inserting adhesive and using screws to temporarily hold the plaster in place until the adhesive dries.

TL;DR I am a beginner investor, I have a flexible full time job, and I want extra income in general/to funnel into my REI business.