MIAMI — A five story blue-and-white office building overlooking an LA Fitness in Boca Raton is a key cog in President Donald Trump’s mass deportation plan.

It’s the home of GEO Group, a 40-year-old company that operates more than four dozen immigrant detention facilities and prisons across the country.

The firm, which was founded by a Greek immigrant who entered the United States through Ellis Island, has cultivated relationships with top figures in the Trump administration, including Attorney General Pam Bondi and immigration czar Tom Homan.

Few companies have made a bigger killing from the administration’s turbocharged efforts to detain and deport undocumented migrants.

Ten days after Trump won last year’s presidential election, the company hired top Trump advisor and former Florida

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