A vacancy injects only 25% decline in rents and it's likely that you should still be profitable :)

the ultimate solution would be to do foam injections into the subfloor, but that is probably out of the question.  

Wow I'm going through a similar experience, although I don't agree with Steven on completely removing yourself from the project, If I understand Daniel he felt the need to inject himself into the project due to a lack of management by the GC and this is a very natural feeling.

Yeah, I do have potential partner/investor who could inject a fair amount of cash.

- If I have the option, should I inject more money in the down payment?

If your pipes are clear and the system is just no longer taking any water it might be time to have the rock excavated out and a new injection well put in place.

You need to preserve some liquidity so you shouldn't inject every penny you have.Perhaps the owner would be open to a staggered payment of 25K for 3 years?

I currently work a full time job in the Injection Molding/Electroplating Field as an Engineer.

Don't let him inject fear into you to provoke irrational action.

He is also correct about the 10% property owner injection requirement.