The quickest and easiest way to clean all of the external facades was with two Building Maintenance Units. For the suspension of the RopeClimber, 20 sections of SafeAccess monorail have been installed to maintain internal courtyards. The battery-powered hoist does not require a large storage area. It is simple to transport between the courtyards and can reach out to remote facade areas.SIRVE Institute - Seismic Protection Technologies has thoroughly evaluated and approved the engineering calculations for both systems. FBA Gomyl designed and manufactured the BMUs.