That's the message New York City officials are sending out to residents after a big discovery was made in Brooklyn.
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The New York City Department of Buildings said officials discovered a 480-square-foot swimming pool built atop an occupied building on Tuesday.
Officials said it wasn't built to code. It was drained and removed that day.
The DOB said the 30x16 feet wide, 4 feet deep pool was holding nearly 60 tons of water.
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The building houses a day care center on the third floor, officials said.
The DOB was reminding NYC residents who would like to have a rooftop pool to look into the proper permits and "hiring professionals to do the job properly."