It is the seller's responsibility to notify HPD of any change in the date of sale to avoid an interruption of subsidy payment. Preferred payment methods include: money order, MasterCard, Visa or American Express.Op transfer is the process of transferring ownership of a share in a cooperative apartment from one party to another party. You must pay the Real Property Transfer Tax (RPTT) on sales, grants, assignments, transfers or surrenders of real property in New York City. To initiate a co-op transfer, you will typically need to notify the cooperative board or management company of your intention to transfer your shares. IMPORTANT. Always submit pages 1-4 of the return. Attach Schedules A through H, Schedule M and Schedule R as required. Notify the State: Tell New York State or the Federal entities about the ownership change. You might need to fill out forms or pay fees. You each have full control of the disposition of your half of the shares.