<prompt> Translate the following text to EnglishIngawa jengo kuu halijafunguliwa kwa umma, makao rasmi ya serikali ya Ureno yaweza kutembelewa kwa ziara zilizoandaliwa kimbele, zilizoongozwa.  <response>: Although the main building is not open to the public, the official residence of the Portuguese government may be visited by prearranged, guided tours. 