@Mark Hill
Not giving advice here as I think you still need to consult an attorney about your situation, but here's my take:
If you are only a silent partner, why not create an LLC in a different state and try to avoid $800 minimum tax? I guess it depends what you are doing for the company here in CA if it rises to the point of "doing business" in CA. If you are not managing it, servicing it, making decisions, etc. you might be okay. If you will be making management decisions, then, yes, you'll be stuck with the $800. The min tax certainly is annoying but well worth it to have your legal liabilities covered and your interests protected if you need a separate LLC.
If you are both wiring money to the escrow company at a 50% interest, how will title be held? I thought you said title was being taken in the partner's name? You said "they will be purchasing the property and obtaining the loan" so there IS a loan at the individual level on behalf of your partner, but no note or loan between both of you? Is that what you mean by there's "no note or loan"? Sounds to me like on paper it will look like you gifted him 20% of the purchase price, he purchased the home in his own name, created an LLC and put the property into it, then gifted you an interest in the LLC. I know it's hard to get financing in the LLC itself, but if I were you, I would want some documentation so that he is liable to you to contribute the property to an LLC. Could be in the form of a note. What is to stop him from receiving your downpayment, taking title in his name, and never talking to you again? He holds title free and clear and you have no documentation to back yourself up other than maybe some correspondence which may or may not be binding on him. Again, I think you should get an attorney involved and have this done correctly. You certainly don't want to blow the corporate veil as that defeats the purpose of having an LLC in the first place, nor want the IRS to look at it as a series of gifts which unnecessarily eats into your lifetime exclusion and annual exclusion. Maybe I'm being too conservative but I personally wouldn't be so quick to wire so much money without documentation to protect myself. I'm sure your partner is trustworthy and a good person, but in this litigious time, better to be safe than sorry. And if I were the partner, I would want to make sure you sign something that says you are also liable for the note or agree to have the LLC assume the note. If it's taken out in his name... the bank is coming after him short of having a personal guaranty from you...
Your existing LLC agreement can be amended so that the profits and losses from certain properties can be allocated to different partners per the agreement, but as I said, the properties will be held and owned by the COMPANY. And you each hold an ownership interest in the COMPANY, not in the underlying real estate. You can amend the ownership percentages so that you have a higher ownership interest in the company but once you own a share of the company, you each own that percentage of the company's assets... which now include your solo property. The deed says Mark's LLC, doesn't specify a percentage ownership between Mark and Mark's partner. You can maybe make a very customized document that requires your partner to obtain your consent or have unanimous consent before making decisions regarding your solo property, but he undoubtedly would have an ownership stake in it... not directly... but through his ownership share in the company. Maybe you can check with whoever gave you that advice and knowledge in the first place saying you could do that and have them explain it to you, but I think the most conservative way would be create a new LLC. As I said, good legal advice is most certainly worth the payment, as is the $800 likely. Not giving advice here, just my opinion and two cents. Follow up with counsel.
If you need references for attorneys in San Diego, I can help you out, but my resources don't really extend to Nor Cal.
*None of this post is intended to be legal advice. It does not create an attorney-client or CPA-client relationship. Readers are directed to seek professional advice.