6 dramatic before-and-after renovation photos of decaying buildings

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Courtesy of the National Trust for Historic Preservation

The Tennessee Theatre in Knoxville after its restoration in the early aughts.

If left without repair, our most treasured buildings can deteriorate over time.

The Federal Historic Tax Credit (HTC) is the US government's most significant investment in the historic preservation of all kinds of decaying buildings, from theaters to prisons to hotels.

Since 1976 - when the HTC was permanently written into the national tax code - it has leveraged over $78 billion to restore more than 41,270 buildings across the US. When private investors choose to rehabilitate a historic structure, they receive a 20% income tax credit as an incentive.Advertisement

The organization shared photos of a few of the largest HTC projects from recent years. Here they are.