A method of extending user access to a guest in a building space in a building system including at least one of a cloud computing environment and a control device associated with the building system to execute the method. The method includes receiving a request for access to a building space, the request associated with providing access to the building space for the guest, the request including a unique identifier associated with the building space, notifying a user associated with the building space of the request and requesting an authorization to provide the access to the building space, and receiving an authorization from the user associated with permitting the guest access to the building space associated with the unique identifier. The method also includes transmitting the authorization to the guest and permitting access to the building space associated with the unique identifier based on the authorization.