But I can't seem to find any information about what are legal requirements for owners and property managers.

I am exploring "office hacking" but i don't know if there are any legal or zoning issues with something like that. 

If you need financial help, ask under the "Finance, Tax, and Legal" forum.

After looking into it more, I'm concerned about potential tax implications and legal issues, such as piercing the corporate veil.

So you may not NEED a lease signed for your primary residence already, especially since that's a lot of stress to find a new tenant and have a lease in place while you're under contract on another home.

Quote from @Jerry Cox: Quote from @Michael Dumler: @Jerry Cox, be mindful of your dates and contingencies within the binding agreement if you go under contract.

I ain’t no lawyer (except on the Internet), so will possibly have to resort to checking with the lender (BoA) to confirm as I didn’t see anything in the contract that suggested that it closes if I’m no longer resident.James

You can always go into contract for your new properties before you close the sale of your old property. 

One PM company I dealt with back in San Diego... thankfully not in OC... buried costs for advertising and re-leasing in their contracts.

Knowing this information will help you identify the right professionals to bring on board.At minimum, your team team should include:Financial Advisor: to help with investment strategies - portfolio diversification and risk management.Real Estate Agent/Broker: to help with property acquisition and market analysis.Accountant or Tax Advisor: to help manage financial records, tax planning, and optimization.Attorney: to provide legal counsel for contracts, agreements, and investment structures.Mentor or Coach: to offer guidance, insights, and industry knowledge.Networking and Relationship Builder (for everything else you will need): to connect you with potential partners and collaborators.