KEDUDUKAN SURAT PESANAN DALAM PROSES JUAL BELI APARTEMEN CASA GRANDE RESIDENCE TOWER AVALON (STUDI ATAS PUTUSAN PENINJAUANKEMBALI NO. 53 PK/PDT/2021): The Position of Order Letter in The Sale and Purchase Process Of Casa Grande Residence Tower Avalon (Study Of Judicial Review Decision No. 53 PK/Pdt/2021) (Faculty of Law, Universitas Trisakti, 2024)