Cammeby's International Group is a real estate investment company founded in 1967 by real estate mogul Rubin Schron. The firm has grown from a single apartment building on Delancey Street to managing more than $13 billion in assets, mainly housing in Brooklyn, Staten Island and Queens but also in other areas of the country. Among the firm's most well-known assets are the Woolworth Building, which Cammeby's purchased in 1998 for nearly $138 million, and the Monterey apartments, purchased in 2013 for $250 million.

In 2003, Cammeby's made an unsolicited and unsuccessful bid to purchase the Empire State Building. In 2015, it filed plans for a 40-story mixed-use building on Coney Island, in the firm's first solo, ground-up development. The firm typically has let its deals make the headlines, but Cammeby's generated news in 2010 when Schron fought a high-profile battle with his former lawyer over ownership of nursing home company Sava Senior Care.

After Albany passed its massive overhaul of rent regulations in 2019, Cammeby's, which owns more than 12,000 rental units in New York City alone, spearheaded a major lobbying and campaign finance effort to roll back parts of the new law and oust the progressive politicians who pushed it through.