If you are looking for temporary housing asap on this spot and it's a private lot, I'd get an estimate for water and sewer set up for one or two RV hookups.

I am interested in any combination of RV parks, small trailer parks, multi-family, and single-family homes. 

Humans are a pack-animal, eon's of a village wise-man, and that's what these positions fulfill today. 

If this property had been in one of the areas zone for more density they would surely have done a normal "Seattle six-pack" of 0-lot-line townhouses but instead they short platted 2 lots to still in effect end up with a six-pack even though in an area not zoned for it, at the cost of having to sell units as condos and deal with other ADU limitations (e.g. 1000sf limit).In 2023 the State mandated Seattle-style ADU regulations across all urban growth area cities/counties, going even a bit further (2 of any combination of attached/detached allowed).

"Let me buy you a pack of gum.

I usually provide a variety pack of command strips and those felt furniture leg things at move in to protect my floors.

I've been looking at investing in small, multifamily property, fix and flip (or hold), storage units, truck/rv/boat storage lots, etc.

. - Comparative Value : RV Park, Storage Facility, Industrial, Warehouse, 5-100 unit multi family anyone?

Tiny homes and ADU's generally face a lot of challenges as they are a disruptor to the RV and mobile home markets.

If you are new and focused on sub-to and seller finance, you can pack it up now.