My company is very young and its purpose currently is to grow my capital so that I will be better equipped to purchase investment properties.

They suggested 85 cents on the dollar.So, let's say they spend $100k on the building improvements (furniture, equipment not included).They want that to count as $85k toward the purchase of the building at that future improved value.So future value could be established as 420k + 100k = $520k.50% ownership would cost $260k, minus their credit of $85k = They would contribute $175k cash to obtain 50%.Is 85% credit the right number? 

So my wife and I have been negotiating with a home owner for about 2months now and this is our final proposal that he has agreed to:Property is worth 640k with current adult family home set up or 690k when fixed up without the adult family home equipments.

Since the current restaurant (who was leasing the property) left it now looks like a vacant house (all equipment is gone).

Add in equipment financing, truck financing, etc., and you'll see why I consider your emotional, non-business decision making as an 'unforced error'.

I initially plan to use the land to place a steel storage container on for storing equipment and tools used for my business.

I have been in the heavy equipment industry for over a decade so I'm very familiar with demolition, excavation, road/driveway construction and more. 

JDI know what your going throughI had to learn from hard knocksit is my suggestion once you get the deal closed and you have the keys go through the building and make sure everything is off, breakers, water, gasget you a compressor and a pressure gauge to check the water and gas service- turn the meters off then you can check the service connections to the meters and not just the buildingget you a meter and turn the breakers on one at a time and check for ground faults and line voltage and label the panel accordingly to the breaker, this way you know what circuits are running which areas esp if someone has done work on the propertyas far as the split units or gas packs the only way to know if these units are operating correctly is to turn them on and check your pressures you will need a ac guy if you don't have the equipment to do this workenjoy

Both are original equipment. 

Did you get a new roof and new mechanical equipment with the purchase?