This thesis on the theme "Apartment with car for rent - residential buildings with an integrated (e-)car-sharing offer as a future trend, needs and challenges in the implementation and use of (e-)car-sharing as an innovative mobility concept in residential buildings from residents and operators view" focuses on the functionality, organization and analysis of (e-)car- sharing systems in residential buildings, as well as the comparison of residents mobility habits and needs with the mobility offer (e-)car-sharing in residential buildings. The aim is to answer the following question in this thesis: "To what extent do the residents mobility habits agree with the characteristics of (e-)car-sharing offers in residential buildings and what kind of measures promote the consumption and user frequency of these offers?". From the methodological point of view, a comprehensive literature research in the form of a secondary research, as well as personal surveys among operators of (e-)car-sharing offers in residential buildings and an online survey of the residents of residential building (users and non-users of (e-)car-sharing) were carried out. The basic factors to meet the mobility needs of residents of residential buildings are very similar among the residents. The most important factors are time, cost, convenience and environmental friendliness. However, the individual interpretations and expressions of these and other supplementary criteria are, in part, very different. In general, car-sharing covers the factors to meet the mobility needs of the residents, but not always in an optimal way. Partly, the factors are better covered by other means of transport. Car-sharing should instead be implemented as a complement to existing means of transport, in particular public transport. It should offer added value for the mobility of the residents. A combination of the use of different means of transport and mobility concepts is desirable and necessary. The willingness to change the mobility behavior and therefore to use a car-sharing offer instead of the private car is highest when people change their residential location. The use and frequency of use can be influenced in particular by a targeted early promotion and visibility of the mobility offer car-sharing, as well as by low entry barriers in case of registration. Above all, complementary adaptation measures from the legal point of view are necessary to promote car sharing in residential buildings, such as an adaptation of the tenancy law or an easing of the pitch obligation.