Historical clue formulations

• Chicago's ___ Center, formerly known as the Amoco Building — 2024-10-26
• Multinational financial services firm — 2023-01-19
• Chicago's ___ Center — 2022-09-30
• ___ Center (Chicago skyscraper) — 2020-02-26
• Chicago's ___ Center — 2017-11-11
• Chicago's ___ Center — 2016-03-16
• Get an ___ (ace) — 2015-06-23
• Get an ___ (77-Down) — 2014-07-06
• ___ Center (Chicago skyscraper) — 2014-04-21
• ___ Center (Chicago skyscraper) — 2010-10-27
• ___ Center, second-tallest building in Chicago — 2008-06-21
• ___ Center (Chicago's second-tallest building) — 2006-12-08
• Get an ___ (ace) — 2005-09-27
• Get an ___ (ace) — 2002-02-17