There are two parties here: A & B. Assume A and B are typical market participants.
A is the developer who will build the project and pre-sell some units. In that pre-sell, the developer incurs marketing costs and collects pre-payments for the unit.
B is an investor who purchased the project from the developer when it is complete but some units have not sold and no unit has closed. The value of the transaction to B is based on the cash flows it will receive once it takes ownership.
A can sell the project based on the value B puts on it. Both are typical market participants, so that value will be market value.
B is not going to receive as part of its cash flows what A has already received for as payments for the pre-sold units.
A is not going to be able to price and receive the project based on the gross prices (less whatever discounts) of the units it has already pre-sold and has collected pre-payment on. The market (B) is going to pay based on the cash flows it receives, and it will receive something less than the contract price for those units that have already sold. B is going to pay market value for the market value of those pre-sold units; the market value of the pre-sold units is the purchase-price less whatever those buyers have paid to A in pre-payments (plus typical discounting identified below).
Depending on the duration of the sell-out, the cash flows to B will be subject to some discounting and other marketing & holding costs, as well as B's EI.
Value concluded is market value. B pays market value for the value of the cash flows which it will receive. If those cash flows are reduced because some units have pre-paid, then B still pays market value but, presumably, the market value is lower because the cash flows have been reduced.
This is a market value assignment (IMHO).
It would seem to me that the rights being appraised are fee simple, subject to pre-sell contract terms.