Spec Home build/ Partnering up question?

[Scott Sinan]

Hi, I'm potentially partnering up with some long term family friends of mine to build a house on my property.

I bought about a 1/2 acre  property for 75,000 in the Tahoe area a couple of years ago for a new build for my family and I. Some other projects I have going on have not gone through which is forcing me to not build as soon as I want. The market is quite hot and I talked about partnering up with them on this project. I have the architectural and engineering plans already paid for and was looking to get the permits to start building. In total I have about $110,000 into the project. They have suggested they would partner up with me and take over the build/liablilty with a private money loan to get the construction done faster. He is a contractor and will be the project manager, and she is a realtor who will represent the property to sell. Any way they have suggested a 60/40 split on the profits. Them 60, me 40.  

They have said that taking on the risk of the loan is why they feel comfortable with a 60/40 split. However, I pointed out that they stand to make money from the build and the realtors commission on the back end. Which they are entitled to! 

My question is since there is added value at the back end of the project, I'm still asking for a 50/50 split on the profits of the sale. Am i off base or does this seem reasonable? Just as a side note they more then likely will put the same amount of money into the project between the Permit cost ($50,000) and the private money for around 5,000 a month for 12 months. ($60,000)

I'd appreciate any tips or insight on negotiation as i'm still somewhat of newbie in real estate.