Tesis ini membahas konsep hukum mengenai perlindungan dan kepastian hukum bagi pembeli lelang yang beritikad baik. Perlindungan hukum dan kepastian hukum bagi pembeli lelang di sini, berarti bahwa barang yang dibelinya melalui lelang itu seharusnya bebas dari tuntutan pihak ketiga, pembeli lelang mempunyai hak penuh atau hak absolut atau hak kebendaan atas barang lelang terkait, seperti hak milik atau hak kebendaan lainnya yang dapat dipertahankan terhadap gugatan dari siapapun.Penelitian ini difokuskan kepada perlindungan hukum bagi PT. Bumijawa Sentosa sebagai pembeli lelang yang beritikad baik dalam sengketa lelang Gedung Aspac dengan PT. Mitra Bangun Griya (sebagai pihak yang merasa berhak atas Gedung Aspac yang dilelang BPPN). Adapun tindakan BPPN yang melakukan penawaran umum (lelang) secara langsung tanpa meminta bantuan Kantor Lelang bertentangan dengan peraturan perundangundangan yang berlaku di Indonesia dan apabila dipermasalahkan secara hukum maka penjualan Gedung Aspac dapat dibatalkan karena penjualan tersebut tidak sah dan cacat hukum. Penelitian ini adalah penelitian kualitatif normatif dengan tipologi penelitian preskriptif.Hasil penelitian adalah perlindungan hukum dan kepastian hukum bagi PT. Bumijawa Sentosa dalam memperoleh Gedung Aspac yang telah dibelinya ditunjukkan dengan telah dilaksanakannya eksekusi Gedung Aspac oleh PT. Bumijawa Sentosa berdasarkan putusan Hakim Pengadilan Negeri, Pengadilan Tinggi dan Mahkamah Agung baik dalam tingkat Kasasi maupun pada saat Peninjauan Kembali yang semua putusannya telah memenangkan PT. Bumijawa Sentosa dan mengesahkan pelaksanaan lelang yang dilakukan oleh BPPN.This thesis discusses about the legal concept of the legal protection and legal certainty for the good faith purchaser in the auction. Legal protection and legal certainty for the purchaser here, mean that goods which was bought through such auction was supposed to be free from any claims of third parties, purchaser has the full rights or absolute rights or rights over auction-related goods, such as property rights or rights of other material that can be defended against a claim from anyone.

This research is focused on the legal protection for PT. Bumijawa Sentosa as the good faith pruchaser in auction disputes of Aspac Building with PT. Mitra Bangun Griya as the party who feels entitled over Aspac Building which has been auctioned by BPPN. BBPN?s action which conduct direct public offering (auction) of Gedung Aspac without asking assistance of the Auction Office is against the prevailing laws and regulations in Indonesia and should this action is disputed from the legal side then such sale may be annuled since such sale is not valid and legally flawed. This research uses normative qualitative research with prescriptive typology research.

The result of this research is legal protection and legal certainty for PT. Bumijawa Sentosa in obtaining Aspac Building which has already been bought as indicated from the executions that have been done by PT. Bumijawa Sentosa based on the decrees that have been rendered by the Panel of Judges in District Court, High Court and Supreme Court both in the Cassation level as well as on the Civil Review, whereby all of the said decrees have been rendered in a favor of PT. Bumijawa Sentosa and ratifying the auction process which has been conducted by BPPN.