Services In Exchange for Partnership - HELP

[Robert Feinstein]

Hey BP nation, I have a question and could use some advice. I am an architect, designer and project manager with over 25 years in the business. I have owned rental property, flipped a few house in NJ. I am now currently working on a row-house renovation to rent in Philly. (separate from my question, just a little background on my experience) 

I have architecture clients that have invited me in on a piece of a deal flip deal. They are bringing the cash and I am bringing the experience. My Question is  - Can I / Should I get paid for my services as part of contribution/expenses when we settle on the property? They get their principal returned to them, should i in return get my sweat equity back? $30-35K in time and my 25+ years of experience?? I wait till the end like they do. Any advice?? thanks in advance.