The Dayton Masonic Center, formerly the Dayton Masonic Temple, is a significant building in Dayton, Ohio. It was built by a Masonic Temple Association formed from 14 Masonic groups. The building was finished in 2 years and 9 months, by 450 workers, most of whom were Masonic Brethren, of whom it was said "Without thought of honor or gain, these men gave unstintingly of their time, abilities and means, sparing neither themselves nor their personal interests to advance this building project to its happy fulfillment." The building is 265 ft long by 190 ft wide by 80 ft high, and encloses 5000000 cuft. It is made of steel, cement, and stone, including 55,000 cuft of Bedford stone and 15,000 cuft hard limestone and marble from Vermont, Alabama, and Tennessee. It is a contributing property in the Steele's Hill-Grafton Hill Historic District, which was added to the National Register of Historic Places in 1986. The building is also included in a locally designated historic district.