Cops raided a New York apartment building Tuesday and found it had been turned into a pot farm.

Acting on a tip, police broke down the door at 610 Morris Park Avenue in The Bronx at 1:00 p.m. local time and discovered a staggering 600 marijuana-growing pots. They filled the top four floors of the five-story building.

Officials estimated there was 1,500 pounds of pot growing in the building, and at $5,000 a pound, it had a street value of about $7.5 million.

Cops also found there had modifications to the ventilation of the building and other changes.

"It was like a pot farm in there," one law enforcement source said. "They were using enough electricity, grow lights and such to power an entire city block."

Three suspects in their 20s were arrested on drug dealing and drug possession charges.

Click for more on this story from the New York Post.