The property and loans are in an LLC and need to be kept that way because of restrictions in my current W2 job.

There is good potential there, but in addition to the age restrictions I wonder what restrictions might exist in regards to exterior modifications (color, siding material, windows, landscaping, etc.)One co-op I was reading about today had their agreements accessible, and it read like 1 of the applicants need to be 55+ and then other applicants just need to be older than 19.

Not your business.In general, California State law prevents landlords from prohibiting or restricting a provider's child care operations.

While I abide by the laws, I want to do everything in my power to avoid having further rules that will impose long-term restrictions on my business.

Currently getting a HELOC on your primary residence is possible in CA, because of the restrictions on Jumbo loans, a lot of lenders and buyers are getting creative using HELOCs.

We live in San Diego so attending a meetup will be tough for the foreseeable future given travel restrictions.

They may have their own restrictions on the number of loans they grant to one person, but there is no "10 loan rule."

Do you see mortgage suppliers withdrawing or becoming more restrictive and is that having a large impact on real estate demand?  

We got lucky with this, as during the coronavirus some landlords are restricted to what they can and cannot do with the utilities. ...Pausing the lessons we learned here, time to get more caught up on the story.

So the restrictions of a 1031 I don't think will be a problem for you.There's no bad choices for you here.