Assuming the market value is around 200K now, why would any investor leave 50K on the table, to keep a renter happy?    

People generally leave money on the table when they have to move in a certain house during a certain time.

Maybe make a more specific list of your skills that you could bring to the table and then identify other skills that you would need a partner for.

Depreciation has several CLASS tables with different rates for each, used for things like appliances vs kitchen cabinets.The property per say is 27.5 years and is depreciated using Straight Line (simple average applied each year) or a Double Declining Balance method.see https://www.irs.gov/uac/about-publication-946

The owner wants to sell, pay off his loans, and bring nothing to the close table.  

Together with my project managing background I am able to bring budgeting and planning skills to the table as well. 

When you get a sharp run up from the price, taking some off the table to prepare for the next opportunity or to help survive the next down turn. 

Hopefully most of the improvements are reusable for a future restaurant and in many cases they will be unless they install a bunch of hoods and table top grills at the seats.

You need to find that because if you're bringing nothing to the table, no money, just an address and a contract, that means you are a major risk.

They oversee most of the work and I could bring 200k, maybe more, to the table.