ROCKLAND — The methadone clinic that has operated quietly for nearly 20 years has filed an application to relocate within the city.

Jim Horwitz submitted an application with the city’s code enforcement office on Dec. 27 to convert 231 Park St. into a methadone treatment facility. The property is owned by Alan Sewall but is marketed for sale for $515,000 with a sale pending notice.

The New Season Treatment Center clinic is currently located at 166 New County Road at the town line between Rockland and Thomaston off Route 1. This was the former Tuttle Shoe Barn and is owned by Ann Tuttle.

The application was filed three weeks after the City Council gave final approval to changes in an ordinance that regulated methadone clinics, also known in city ordinances as sole source pharmacies. The phrase “sole source pharmacy” was deleted from the amended city ordinance. The change allows clinics to operate as any health or human services offices are allowed in commercial zones including where 231 Park St. is located.

The proposal to convert 231 Park St. will go before the Rockland Planning Board. The proposal is set for the Jan. 17 meeting.

The initial sole source pharmacy ordinance was approved in January 2006 as part of  a settlement in a federal lawsuit filed by Turning Tide which had been trying to open a methadone clinic.

Turning Tide initially had proposed in October 2004 opening a methadone clinic at 77 Park St. The proposal sparked widespread opposition with a march by people trying to block the project.

The City Council then voted to change zoning ordinances to prevent it from operating there. The Council voted to limit methadone clinics to Rockland’s short stretch of Route 90. Turning Tide then filed the federal lawsuit, claiming the city was discriminating against people with opiate addictions.

The Council eventually agreed to a contract zone at the location on New County Road.

With the ordinance approved last month by the City Council, a new contract zone will not be needed.

Rockland Police Chief Tim Carroll said there have been no complaints to the police department over the clinic.