We have paid a deposit for a new apartment 'sur plan'. If I understood correctly the convention signed at the time the deposit was paid, 20% of the purchase price should be paid at the time we sign the contract at the notary (which has not taken place) and 80% upon delivery. However, we have recently received an email from the agent asking us to go to a specific bank for a loan during the construction of the apartments. 

I believe this is a change in the terms and conditions of the sale, and would like to know if it is possible to withdraw from the purchase and get the full deposit back.

Since we are not fluent in French, I would like to have a lawyer who speaks English and who can take a look at the convention we signed.

Thanks a lot in advance for anyone who helps...