How the Prudential Center came to be – Bright Solutions from the Dark Age of Urban Planning:

Prudential, pursuing a course of corporate decentralization in the 1950s, settled on Boston as the location for its New England Regional headquarters, with plans for a signature tower. This was a bolder move than you’d expect, as Rubin’s engrossing account of the political and business climate in mid-20th-century Boston illustrates. At the time the tallest building in New England was in Hartford.