When built, 1 Main was the tallest reinforced concrete building in the world with over 275,000 square feet of interior space. The building was leased to Charles Williams Stores, who ran a mail order firm comparable to Sears Roebuck from offices in the building. In 1998, it was converted into 124 luxury condominiums. The building was purchased along with several others as part of a 2 million square foot deal from Harry Helmsley for just $12 million back in 1979. Street Easy is currently listing the penthouse at 1 Main for over $18 million and at the peak of the last reception, had it priced at as high as $25 million.