So far they are 6 months overdue, had to install a new septic (poof, profit is gone), and the "investor" owes the other partner 75k for her half of the deal......Do you think it will end well?  

I cut and installed the granite as well. 

And if that is the case would sub metering the property be doable or easier with hot and cold lines already installed for each unit?  

I would instead install a stick to prevent the window from sliding open.

My agent said that as long as i dont install a shower I should be ok with renting it out as an artist studio or something like that.

We did this about 15 years ago, and the contractor installed an ejector pump. there are also simpler solutions, such as a toilet that is made just for this purpose.I will caution you that this may not be the best use of resources.

I closed on my first house with a freshly installed A/C.

I actually had the iphone app installed for a few years but never used it much for the technology consulting.  

When was the boiler last installed? 

You could do an installment sale; however, it may just complicate matters with having to file the return all those years.