The 4th unit is in the basement and features an open concept kitchen/living room and has 2 bedrooms.

I furnish kitchen sink and bathroom hair strainers, cheaper than having a plumber come in to rodding the lines.Check and replace strainers as needed

Or are they allowed to heloc guides mimic Fannie.Freddie which are by design residential in nature.

Has full Kitchen in the basement unit6.

Paint, floors, appliances, bathroom, and kitchen updates.

Paint, floors, appliances, bathroom, and kitchen updates.

But if this is part of a long term strategy then it could.If this year you to a tile shower, then at the next turn you do upgraded counters in the kitchen and bath etc....then yes. 

Going forward, I’d suggest designating a tenant representative that you get to work with directly.

I haven't found much of value after a move out or an eviction (well, my son and I once found a packet of what we assumed were drugs and I suppose the tenant would have found that of value but we presented the stuff to our local police instead) but I am a big one on recycling intact furniture to our local Habitat and Catholic Social Services organizations to avoid good stuff ending up in the landfill and donating canned goods to our local soup kitchen. 

To add to @Matthew Forrest's point, a homeowner without previous experience with the design-build process for an ADU should realistically expect 12 months from initial design to completion.