OK, so we have different definitions of "pin". ;-) As mentionend already, if (and how) some particular kind of POI or other data is displayed is up to the application that uses the OSM database. No renderer can show everything, otherwise you would end up in an unreadable map. In this case, Mapnik seems to consider offices less important than ice cafés, restaurants, shops etc. If you use some other renderer or map display application, you may see it. For example, Osmand (the OSM Android app) can search and display way more element types, including architect offices.