From S&P, there are detail info like Lot No., HSD, mukim, etc. Goto relevant land office and do a search.

If you have not transfer title (as above), developer might have paid for the first few years. Subsequent years are left unpaid. You will need to pay off developer before they issue you with receipt/release letter. Then goto land office to settle the remaining years.

You cannot transfer title without settling all arrears.

Also nowadays most developer would not transfer direct to 3rd party anymore to avoid any legal cases. Must transfer from developer to you. Then from your sale, transfer again from you to new buyer.