Oversight HQ from Dark Horizons missing

Hello, I worked my way through the Section Part in Beregost, had the talk with Nikita afterwards where she gives me the Password scroll, but I can't find or access the Oversight HQ in Zentral BG.
AS far as I Know, it should be in the House behind House in http://www.forgottenwars.com/bg1/ar0700.htm.
but it isn't there.

Am i in the wrong location or can anybody tell me which Variables neet to best for the access?