3B Immobilien GmbH is an Andernach, Germany-based startup accelerator backing pre-seed and early-stage B2B startups in Germany. It provides up to €20,000 in start capital alongside mentoring, office space and access to a regional partner network, with a focus that includes enterprise software, IT, SaaS, AI/ML, fintech, healthtech, foodtech, cleantech, IoT and real estate.