For low equity sellers that don't have a lot of equity but it's a pretty house in a good neighborhood and a good school system, the sellers can either sell and bring cash to the closing table to get rid of their house, or they can rent it and wait for appreciation, or they could sell it on terms like lease to own. 

In that case, when you go talk to a potential partner, I would discuss that skills that you bring to the table and draw upon all and relevant skills or experiences that you may have.

As for the windows I would simply inform them they are on my list of to do projects but at present there is no immediate time table.

What do you bring to the table that can help them and what you are you looking to gain?

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.