Going by the info posted, I might conclude that HBU is existing use , that even though subject is in poor condition, the trend is to keep a building and remodel rather than tear it down for land value. I'd write that per RE agent feedback, predominant sale type and which type of property sells for more $, the HBU, conclusion is SFR ( if that is the conclusion).
From there, state the most likely buyer an investor/property flipper and use SFR comps, hopefully finding some that sold in similar poor condition .