On a recent Saturday morning, dust choked the air, and debris rained inside the Church of the Redeemer in Brooklyn, just south of the Atlantic Terminal transit hub. Shards of stained glass panes had fallen onto remnants of floral floor tiles, near stacks of dirt-covered hymnals and mangled metal ceiling panels. Workers were hammering apart walls and carrying walnut pews, which were to be offered for sale at the Demolition Depot in Manhattan.

Last year, the Episcopal Diocese of Long Island sold the property for $20 million, and the church is scheduled for demolition. Its new owner, the Jackson Group, has not announced plans for the empty lot.

Evan Blum, the owner of the Demolition Depot, said he was spending around six figures for the architectural fragments and the removal process. The house of worship, he said, “was a work of art.”

It was completed around 1870, and its architect, Patrick C. Keely, who had mostly worked for fellow Roman Catholics, had an office a few blocks away. The bluestone walls were trimmed in brownstone. Ceiling murals depicted winged creatures. Windows and wall plaques, commemorating congregants and pastors, had inscriptions like “Faithful Unto Death.” Prices for the salvaged goods will range from a few hundred dollars each for batches of tiles to the about $10,000 for stone doorways and stained-glass portraits of saints.