They're also likely to have to refund the entry fee if you refuse to sign the contract: even if they did mention having a secondary contract in the sales contra

They're also likely to have to refund the entry fee if you refuse to sign the contract: even if they did mention having a secondary contract in the sales contract, they didn't make a good-faith effort to provide reasonable terms (for the reasons mentioned above about legality and compensation), so they failed to uphold any part of their end of the contract and should refund the money; if they didn't mention the second contract in the one you made to pay them, then they absolute owe you a refund for refusing to do the work they promised in exchange for your money unless you agree to a unilateral modification of the terms -- they're probably liable for the losses you incurred by assuming they'd follow their end of the agreement, since a unilateral insistence on changing the terms of the agreement once execution has begun is not an attempt to uphold your side of it; finally, in the case that they want to claim the sale was pending your agreement to those terms, their continuing to hold pending funds now that the sale fell through is simple theft. No matter how the city of Detroit wants to spin their terms contract, they owe the people who decline to sign it a refund on their entry fee.