How to value a parking space?
There is a ski company that wants to put up as many condos as parking allows.  My land abuts their parking lot expansion.  There is a 25 foot buffer zone bylaw.  I am willing to negotiate that buffer to be on my land.  

A reduction in buffer zone could net them about 30-40 more parking spaces.  Each 4 bedroom condo requires 2 parking spaces.  So, they have the potential to build an 15-20 additional units.  Each unit will sell for approximately 750k-1million.   

My question is then, what is a good price to ask per parking spot?  I'd like to start high to give myself negotiation room.  My thought is to start at 30k/spot.  The other option I'm exploring is just asking for a condo in exchange for the reduction in their buffer zone.   

Is there a calculation that developers use that would help me understand their position in terms of profit per condo?  

Thank you.  I'm not sure if this is the right subreddit to post this question to.   
[{"id": "ctkqko4", "text": "Even at 750k a unit for 15 units, you're talking $11.25M dollars. \n\nPersonally, I'd take the cash every time over a condo. At the end of the day, we don't have their deal sheet/pro forma so we really don't know what it's costing them to build each condo. Also, they might have the room to build extra parking spaces, but do they have the room to build extra condos? Have they figured into their expenses buying you out of the buffer zone? These are things you need to do a little more research with. But starting high is never a bad thing-- negotiation is the name of the game in real estate development. \n\nAlso, what makes you say that each condo requires two parking spaces?\n\nDisclaimer: I work for ENDVEST.com, a global real estate investment/crowdfunding platform. The concepts in this response have been taken from ENDVEST's Education Center.", "replies": [{"id": "ctku8ck", "text": "Thanks for the response.  The bylaws require 2 parking spots per condo unit.  A parking space is defined as a space 9ft by 20ft.  My grandmother wrote the bylaws for the town in 1980.\n\nThey are truly constrained by parking requirements here.  They are building a new base lodge which has parking requirements.  When the condos get thrown in, their space for parking dwindles.  \n\nThe only other land owner that they could deal with is my Aunt. \nI had dinner with her last week and she told me that they had just filed their permit application for the parking lot expansion/condo development.  The mountain approached her about the buffer zone.  They did this because she is active with zoning meetings and has been pushing for the remediation of iron seep into a local stream the result of the previous resort owners parking lot construction in the 1950's.  The mountain asked my Aunt if they could put the buffer zone on her property so that they could maximize condo construction.  She told them to bite it and warned me about their intention. \n\nSo now, I'm contemplating a deal.  I think you are right about taking the cash.    \n", "replies": [{"id": "ctmvg4q", "text": "Clearly, your family has some pull in the area, both property-wise and legally. I'd leverage that as well-- even large, wealthy companies have a tough time competing with local know-how and age-old connections. Have you spoken to your Aunt about packaging a deal for both of your lands? Maybe you could get an even better deal like that-- if the permission of buffer zones on both lands maximizes condo construction for the Mountain. \n\nAt the very least, having some pull in the town is a seriously strong bargaining chip when it comes time to negotiating a deal for these parking spaces. \n\nLet me know if you need any other help!", "replies": [], "depth": 3}], "depth": 2}], "depth": 1}, {"id": "ctkzl7n", "text": "I don't think there's any definitive way to negotiate value without knowing the developer's perspective. \n\nIt might be that the additional units are of marginal economic value to the development and you could easily pace yourself out of a negotiation. \n\nOr it might be that the additional units will bring the whole project from near break even to a great return. In which case you have a lot of flexibility. \n\nIs there perhaps a rival developer or other insider who you could co silt with, perhaps in return for a percentage of the sale?\n", "replies": [], "depth": 1}, {"id": "ctr1fxt", "text": "1.  sell the buffer zone for $1mln.  \n2.  sell your place before they finish construction.\n3.  RETIRE", "replies": [], "depth": 1}]