Denver has a lot of worse situations.. Here's my personal most hated one:
Current: Federal Reserve Branch
http://denverdailyphoto.files.wordpress.com
Prior: Tabor Opera House
http://www.babydoe.org
WORSE
Current: Parking Lot
http://www.denverinfill.com
Prior: Hotel Cosmopolitan
http://www.denverinfill.com
WORSE TO THE EXTREME
Current: Republic Plaza
http://www.flickr.com/photos/87782196@N08/
Prior: Republic Building
http://www.denverpost.com
Hard to say because this is our tallest skyscraper but we lost a cool building.. I say SAME
Current: EPA Building
http://www.denverinfill.com
Prior: US Postal Annex Building
http://www.denverinfill.com
BETTER