But don't let this guy take advantage of you, you have a business to run after all....you need the money, your family needs the money. 

In my analysis the cost for an ADU in kern county would run about $85K and I have saved about 75% of that right now.  

If your project takes 4 months instead of 2 by hiring a GC it may end up costing more in the long run.

There are a lot of good posts on here so I would take some time and read the forum so you can hit the ground running.

Platforms like Taskrabbit.com offer skilled professionals who can assist with setup, assembly, and various tasks to get your space ready.Cleaner and handyman are key to keeping things running seamlessly, so it's crucial to have them in place before you begin.

You know the area, plus appreciation, you won’t regret having this asset in the long run. 

It's definitely tricky because you want to be considerate and you are also running a business.

For example, you could run 2 weeks using your own data and another 2 weeks with the agency’s data.

Without knowing all of your specifics, I'd say that it's only worth holding on to if you can reasonably expect to have some really good appreciation in the near future (like 5 yrs)....Or, in the case where it would run well as a vacation rental, you could switch the usage, maybe?

With this structure, lenders can offer more favorable terms, including lower interest rates, making your investments more profitable in the long run.