Wellington Management plans a $6 million expansion of an industrial property on Energy Park Drive home to Minnetronix, a medical technology company.

Minnetronix, which already maintains 268 of its 300 employees at the 1635 Energy Park Drive location just off Snelling Avenue, plans to hire 75 more workers there over the next three years.

To accommodate a parking lot expansion, Wellington will pay the city $450,000 for the northernmost 2.2 acres of neighboring land, which had once been used by the St. Paul Fire Department for its Fire Safety Training facility. The fire department had previously moved most of its operations from the 10-acre city-owned plot, which remains largely unused.

Wellington, which owns its existing building under the name Snelling Properties, LLC, has not asked for city funding to complete the expansion, though the company has applied for financing through the MInnesota Department of Employment and Economic Development.