The Office of Retirement Services has moved their walk-in customer service center to the Stevens T. Mason Building in downtown Lansing.
Their new address is:
Stevens T. Mason Building
503 W. Allegan Street
Lansing, MI 48933
Street parking is available all around the area. There is also a public lot just east of Constitution Hall on Allegan Street across the road (south side) from the building.
The ORS walk-in office is located on the first floor through the security gates. You should then take a left past the elevators and it will be straight ahead.