They also had recommendations for insurance providers, and referral for a legal team to assist in setting up my LLC, which I am currently working on.

If you are married and you aren't on title....you legally own that home.  

Will I have any legal issues.

Based on what I have heard/read thus far, it seems like I don't need a formal legal structure such as LLC for running this is as an active business (but I may set up an LLC for asset protection, which is allowed by my mortgage lender).

I know legal ownership and beneficiaries can increase that coverage in a number of different combinations, but are there ways you can think of to expand coverage specifically with the solo 401k's?

The LLC only provides basic legal protection.

But don't expect to make any changes to the docs, because the GP's will not be able to accommodate Invidia requests on the legal doc language.

What’s the legal way to collect payments from roommates that live with me in the same house? 

This new LLC needed a mailing address for normal mailing activities (I’ve always understood that the registered agent address is only for legal mailings vs ‘normal’ business mail).thanks!

In the case of a syndicate, the LLC and its operating agreement help to formalize the legal relationship between investors.