We are in the same situation as you describe. We are curious to know if you have a similar clause 20.1 in your contract with UDC that stipulates:

"If the Seller (UDC) is unable to give possession of the unit within 12 months of the anticipated completion date, the Purchaser (you and us) may on 60 days written notice to the seller terminate this agreement and upon termination, the seller shall refund all amounts paid by the purchaser to the seller on account of the purchase price. The Purchaser shall have no further claim against the seller for any damages, compensation, cost or interest."

Thank you