Grade A supply remains constrained in the North London & Herts market although the recent completion of the Riverlabs refurbishment at Ware provides 90,255 sq ft of laboratory and office space at competitive pricing. There are a number of larger second hand buildings currently being marketed, with the largest being the grade 2 listed Hertford County Hall in Hertford, which provides 203,000 sq ft of space. The availability rate is now at 7.8%, marginally above the long run average, which stands at 7.5%.