An LLP (Limited Liability Partnership, in Germany this could be a GbRmbH) is a form developed for partnerships that were not sharing the business as much as the physical facilities and / or synergy. An LLP could be lawyers (or doctors) combining to offer different fields of expertise in a one stop-shop environment. They would save on support staff supplying general support to their specialty niches (receptionist, secretaries, research assistants &c.).
A disadvantage is the difficulty in providing security to creditors. If an office space is needed with one entrance and seven offices, the landlord would be less willing to rent to clients who insist the entire rent is not important, only their individual portion.