Police have raided a gated mansion used as a cannabis factory in Sutton Coldfield during an operation which netted drugs worth £250,000.
Officers stormed into the seven-bedroom property on the private Roman Road in leafy Little Aston, where house prices top £1 million.
It was among eight addresses raided on Tuesday, leading to the seizure of more than 1,000 cannabis plants and 17 arrests.
West Midlands Police said a cannabis factory was being dismantled at the Roman Road address while at least two of the other properties were also being used as production sites.
Three men were arrested at the Little Aston house.
They were not believed to have been the property owners but were instead “gardeners” looking after the plants, which were said to have been kept in three of the bedrooms.
All three rooms were said to have been equipped with special lighting and foil was pinned on each window to block out sunlight.
Two rooms contained full-grown plants while a room in the attic was described as the “nursery”.
One Little Aston resident, who did not wish to be named, said: “I cannot believe something like this was going on.
“People tend to be very private in this area. You don’t expect a cannabis factory on this street.”
Around 50 officers took part in the raids. The five women and 12 men arrested were believed to be mostly Vietnamese.
They were detained on suspicion of conspiracy to cultivate and supply a controlled drug and remained in custody for questioning.
PC Stacey Paterson, of West Midlands Police’s proactive unit, said £50,000 in cash was also recovered in the raids.
She said: “This operation was carried out in response to public concerns about drugs.
“We hope that it sends out a clear message that this kind of illegal activity will not be tolerated.”