It comes down to having expertise and professionalism. 

Second People feel more comfortable knowing the house was built specifically for the location using local contracting expertise, rather than being made in a house factory.

It's not common in the private sector.

If I can ever help you with my expertise, residential prop mgmt let me pay you back. 

Our work covers just about anything in the residential sector to include new builds, storm work, home design, and complete home renovations.Outside of work, I've enjoyed some success buying, selling, and renting properties.

He has a family and kids and did not have the free time to invest in real estate so he asked me to invest with him knowing that I have the time and expertise that he was lacking.

They represent a new sector of digital-fronted business that are trying to fill the niche you're describing -- business loans, not HELOCs.

At some point, the only way to make a profit is to risk some capital, whether it's time, expertise, or money.   

Gabriel,I am not sure if I could help... but I wanted to commend you for understanding the value of a potential mentors time, knowledge and expertise and being willing to compensate through helping out or money. 

There is also a solid base of smaller companies servicing these sectors- healthcare, financial services, manufacturing.