HARRINGTON PARK, N.J. — NAI James Hanson has brokered the $6.6 million sale of an office building in Harrington Park. Located at 200 Old Hook Road, the asset is the former headquarters of water service company United Water, which vacated the building in 2014. The property was constructed in 1977. Andrew Somple and Greg James of NAI James Hanson represented the seller, SUEZ Water, formerly United Water, in the transaction. Allegro Senior Living acquired the property and plans to reposition the property as a senior living facility. The location will be Allegro’s first facility in New Jersey. Allegro and joint venture partner, United Way, have received approvals to construct 83 independent living apartments and 92 assisted living units, of which 25 are memory care units.