text: https://geoinfo.frankfurt.de/mapbender/application/stadtplan?visiblelayers=866/4236&scale=2500&center=477190,5551460
  
  Here in years 2017, 2015, 2014 and 2013 it can be seen. (2012 to 2017 is osm usable open data: https://offenedaten.frankfurt.de/dataset?organization=stadtvermessungsamt )
  It can be seen even clearly in older images like 2009 and 2007 and is visible even in 2000.
  
  Sometimes the big building (and its shadow) just covers the small one in satellite imagery.