EASTHAMPTON -- One of the state's first recreational cannabis shops is slated to open before the end of the year at the Keystone Mill.

Principals with I.N.S.A., Inc. appeared before the Planning Board Tuesday and walked away with a special permit to conduct recreational adult cannabis sales at the site of their current medical marijuana dispensary at 122 Pleasant Street.

The permit was granted with six conditions, including a provision to have INSA return in three months, and again in six months, to iron out any problems with parking, traffic, and other protocols.

The recreational portion of the shop could be up and running before Thanksgiving, said said Stephen M. Reilly, general counsel for the enterprise.

The state is poised to let some marijuana grown for medical purposes be sold as recreational, said Reilly. He described a process where the sales are carefully tracked. The rules could change as the volume of marijuana grown specifically for the adult recreational market catches up, he said.

Marijuana rules are in flux as the Cannabis Control Commission takes over regulatory duties from the Massachusetts Department of Public Health. Moving forward, the CCC will be in charge of both programs.

Any waivers granted to INSA by the state must be reported to the city. If the waivers are deemed "major," the Planning Board could take steps to amend the permit.

The shop plans to be open between 10 a.m. and 11 p.m.

Director of Operations Ian Kelly said that he expects traffic to be high for the first six months of sales, and to abate as more recreational cannabis shops open in Western Massachusetts.

CEO Mark Zatyrka said that INSA has been a good neighbor in the mixed-use mill district and will continue in that vein. The principals said they have been in communication with Police Chief Robert Alberti, who plans to tour the site once again.

INSA has grown and evolved since it opened in February as a medical dispensary.

In April, Zatyrka and his team described plans to enter the recreational market. In May, INSA opened a second medical dispensary in Springfield. In July, INSA gained approval to double its marijuana cultivation space up to 89,000 square feet. In August, INSA was provisionally approved by the Massachusetts Cannabis Control Commission to sell recreational products.

The company negotiated a host community agreement with the city. In addition to the 3 percent community opt-in tax, INSA has agreed to pay Easthampton 3 percent of its gross adult use retail sales.

Around 75 people are employed at all INSA facilities. The company says it will up its hiring with the recreational component.

Materials that INSA supplied to the Easthampton Planning Board are available on the city's website.