For example, you could create a weighted structure where a percentage of profits is based on cash contributions, and another portion compensates for rehab or management efforts.Rent Payments and Tax-Free Profits:If you structure it as an owner-occupied property, the rent you pay could be shared proportionally, but tax-free gains on resale may only apply to your share, as you’d be the owner-occupant.

Credit is a factor as bad credit may limit options, or may have the lender require you to put 10 or 20 years of taxes and insurance into escrow. 

Can provide all the benefits from a cash flow and tax perspective.

Weigh the long-term benefits of the low mortgage rate you have versus selling and getting $500k from a sale exempt from capital gains tax.

Worse case I just continue to manufacture them through my fix-n-flip business and buy with seller financing where available.Also, is tax lien investing really viable today? 

BRRRR, Fix Flip, taxes, deal analysis, market analysis, marketing, financing, etc.  

That's $1,600 per month plus to pay debt, plus at least $400 in taxes and insurance.

An annual business tax as a hotel of $50 and collection and remittance of transient occupancy tax of 12% from renters is required of all short-term vacation rental operators.

If the purchase is done in cash, as you mentioned, they’d have more flexibility, but they’ll still want to carefully consider the tax and legal implications of the subsequent sales.I hope this helps, and good luck with your client’s deal!

Someone can be a brilliant tax person but horrible to work with, and also vice versa.