I'd try hiring a sewer service to scope/video the main, the vent stack, and if necessary all the way out to where your main meets the sewer.Betcha a donut there is a sewer gas leak somewhere.

Hiring an assistant has the best move I've ever made.

You can’t be the best at all of it, so find your “thing” and hire the best for the rest.Hey Nick, does that invitation extend this way?

We did almost all of the work on this project, and it was great to get that experience, but it also helped to understand the value of our time and that much of the labor would have been worth hiring out.

We've seen too many investor buy supposed rehabbed turn-keys, only to find out they got burned when they hire us to manage them and we provide an Evaluation Video showing he true condition.

If they aren't contributing any cash why not just hire them?

It's 90 units and the plan would be to hire a third-party management company. 

@Kumar Gaurav if it is returning cash after you factor in a PM (even if you do not hire one) then it may be a good idea to keep it.

_________________________________________________________________________________________________With Real Estate syndication you can do things like raise rents, decrease expenses, renovate the building, add amenities such as a swimming pool, spa, or gym, hire new property management, add units, add services such as laundry, valet parking, or online rent payments, and much more.

You can hire people and implement systems to improve your ability to develop relationships and provide value.