(CNN) -- Indiana State Police have uncovered an elaborate marijuana growing operation in Central Indiana inside what they thought was an abandoned building on a busy road.
Police said they think the suspects have been running the operation for more than a year and a half.
Along a busy intersection near industrial parks in Franklin, Ind., it’s safe to say most drivers wouldn't suspect the rundown building on the corner to serve much purpose.
“You'd think maybe storage, some scrap metal or some storage of some sort,” Mayor Joe McGuinness said.
But behind the boarded up doors and garbage bag covered windows was much more that meets the eye.
After pulling a driver over next to the building, police said the officer noticed a suspicious odor flowing from a vent.
Inside was a marijuana grow operation with more than 350 plants, an extensive ventilation and irrigation system, and heat lamps worth $2,000 each. Police estimate the drugs to be worth about $116,000, not including the already harvested plants.
Police said evidence left at the scene should help them track down those behind it, but they're leaning on the public for more help.
Police found receipts inside the grow house that indicated some of the irrigation equipment was bought at hardware stores in Central Indiana.
Investigators are also reviewing surveillance from nearby businesses.