It's not disclosed. It's something understood by the public. Whatever costs are incurred by the builder will be shouldered by the buyer. The builder is out to make money, not charity. They estimate the costs to build the condo, promotions, property taxes, development fees, cost of land purchase, etc. Then they have to take into account the amount of profit they can earn from selling units. Hence the rising costs in pre-constructions. Getting 2% PST back as adjustment from the builder is at their discretion. The 2%, I think is on material fee or whatever fee is paid that requires PST and not on the full amount of your purchase price. I could be wrong, but PST is not paid by the builder on everything (eg. profits).