I've been trying to create a list of the tallest presently unused building in every state, but it can be hard to find current information. I know not every state has unused multi floor buildings so this list might not ever be complete. If you know the current tallest unused building that has not begun renovations in any of the states I'm missing, which is most, please let me know.
Alabama:
Brown-Marx Building/Birmingham/16 floors/210 ft/unused since 2002
Alaska:
Polaris Building/Fairbanks/11 floors/? ft/unused since 2000
Arkansas:
Medical Arts Building/Hot Springs/16 floors/180 ft/unused since 1991 besides ground floor retail
Connecticut:
Remington Shot Tower/Bridgeport/10 floors/167 ft/unused since 1986
Kentucky:
Gabe's Tower/Owensboro/13 floors/175 ft/unused since 2001. Demolished 2020.
Louisiana:
Plaza Tower/New Orleans/45 floors/531 ft/unused since 2002
Michigan:
Executive Plaza/Detroit/22 floors/290 ft/unused since 2002
Missouri:
925 Grand/Kansas City/21 floors/298 ft/unused since 2008
source
New Jersey:
Griffith Building/Newark/14 floors/210 ft/unused since 1973
Ohio:
Centre City Building/Dayton/21 floors/274 ft/unused since 2012
Pennsylvania:
Martin Tower/Bethlehem/21 floors/332 ft/unused since 2007. Imploded on May 19, 2019.
Rhode Island:
Bank of America Building/Providence/26 floors/428 ft/unused since 2012
South Carolina:
Heritage USA Hotel/Fort Mill/21 floors/unused since 1987
Tennessee:
100 North Main Building/Memphis/37 floors/430 ft/unused since 2014
Texas:
801 St. Joseph Parkway/Houston/30 floors/325 ft/unused since 1998