Gedung Sudirman 7.8 Tower I Lt.25 Jl. Jend. Sudirman Kav. 7-8 Jakarta Pusat 10220

Phone: 62-21-3973-1111
Fax: 62-21-3973-1212
Email: corporate.secretary@mastersystem.co.id

Apl Tower (Kawasan Central Park Office Tower), Lantai 37 Jl. Letjen S. Parman Kav. 28 Jakarta 11470

Phone: 62-21-252-4555
Fax: 62-21-570-5988
Email: —

Telkom Landmark Tower Lt. 27 Jl. Gatot Subroto Kavling 52 Jakarta 12710

Phone: 62-21-2793-3363
Fax: 62-21-2277-0817
Email: corporate.secretary@mitratel.co.id

Menara Jamsostek, Menara Selatan Lantai 10 Jl. Jend. Gatot Subroto No. 38 Jakarta Selatan 12710

Phone: 62-21-7280-0667
Fax: 62-21-7280-0664
Email: —

Gedung Ariobimo Sentral Lt. 10 Jl. Hr. Rasuna Said Blok X-2 Kav. 5 Jakarta Selatan 12940

Phone: —
Fax: —
Email: —