Luthuli House is a 12-floor Building at 54 Sauer Street, Johannesburg. The ANC headquarters are officially located on the 7th floor, while the 6th floor houses the office of the Secretary-General. This constituency office ceased to exist from 6th May 2014.

Geolocation
28° 2' 6", -26° 12' 14.4"
References

https://www.pa.org.za/organisation/anc-constituency-office-151-chief-albert-luthuli-house/