I don't have much advice as now the profits are gone and it seems like the best thing to do is to get your money out the deal and move on.  

Any specific regulations or best practices to be aware of?

Wishing you the best! 

I was looking to get some advice on the best way to finance a small mixed-use property?

Just wanted some Input as to where would my Marketing Dollars be best spent?

This is the best platform as a starting point. 

Imagine making millions of dollars over the course of your career and then having to pay 30-50% every year to uncle sam instead of compounding that cash over time.This is exactly what real estate professionals have learned to mitigate.To reduce their taxable income, they just buy a building every year, do a cost seg, and use depreciation to reduce their tax liability dramatically.Their personal wealth snowball grows much larger and much faster than their W2 counterparts who give most of their money back to the government each year.Following this strategy as a real estate professional is one of best ways to end up with a much larger net worth at the end of your career.

Refi the house so they can continue to live in it, they will get the best loans on their primary residence.

What would be my best route to take if we need additional finances?

.), could help you cash-flow while you build equity - best of both worlds.Lastly, targeting properties that have been on the market 30+ days could be a good start.