Altbau/Sanierung BV Kistner in Kirchheimbolanden 2021 BV Hoffmann in Kirchheimbolanden 2020 BV Wolf in Gundersheim 2019 bty bty bty bty bty bty bty bty bty bty BV Bektas in Alzey 2019 bty bdr bty bty bty bty bty bty bty bty