Who keeps the original option to purchase document after the seller signs it, the seller or the seller's lawyer

In Singapore, after the seller signs the Option to Purchase (OTP), the original document is typically kept by the buyer. Here’s the process:

- The seller grants the OTP to the buyer, usually in exchange for an option fee.
- The buyer then has the exclusive right to purchase the property within the stipulated option period.
- The buyer is responsible for keeping the original OTP document, as they need to return the signed OTP to the seller if they decide to exercise the option to purchase the property.

The seller or the seller’s lawyer may retain a copy of the OTP for their records, but the original document is usually in the possession of the buyer.