The territory of the Binnenhof was purchased as early as 1229 by Count Floris IV, Count of Holland. Many years later, the purchased territory was expanded when son William II came to power. He built the wall around the “keep” and also had the prison gate built. The purpose of the renovation now underway is to future-proof the Upper and Lower Houses. In addition, it is also to preserve 800 years of cultural heritage. On Binnenhofplein, all the space is taken up by the construction work and the supply and removal of materials, leaving no workplaces left for the aforementioned construction workers. They therefore work from a floating chain park in the Hofvijver. The location of this pontoon was carefully chosen to minimize disruption of the view of the characteristic Binnenhof facade. The water level in the Hofvijver also contributes to this, as it is considerably lower than the street level, making the chains less conspicuous. The architects have made every effort to give the chain park an attractive appearance. For example, there will be a mirror wall around the entire pontoon and a dune landscape will be created on the roof; after all, The Hague is a “city by the sea. Moreover, this mini-piece of nature contributes to the biodiversity of the city center. Visitors can view this green and yellow roof from a specially built observation tower. The pontoon island on which the chain park stands was built by Van Schie. The company from Mijdrecht has extra heavy. The architects have gone to great lengths to give the chain park an attractive appearance.For example, a mirror wall will surround the entire pontoon and a dune landscape will be created on the roof; after all, The Hague is a “city by the sea.Moreover, this mini-piece of nature contributes to the biodiversity of the city center.Visitors can view this green and yellow roof from a specially built observation tower.The pontoon island on which the chain park stands was built by Van Schie.The company from Mijdrecht used extra heavy pontoons for this, partly because of the piece of urban nature on top of the roof.The floating platform measures 35 x 28 meters and is accessible via an adapted staircase and a floating walkway.In addition to this chain park, Van Schie delivered another work pontoon, certified for working with aerial work platforms.This pontoon was used to inspect the facade of the Senate building.