Management Right is the right of control over land which is realized by granting the status of lands that are not burdened with rights under the term “state land”, so that most of the land granted the status of “Management Rights.” State land granted this status that is especially intended for government institutions/agencies (such as BUMN or BUMD) in able to be order to make good use of it for carrying out tasks or to generate profits by giving it to third parties. The formulation for the problem in this paper is whether the extension of the right to build on Managament Right can be carried out without the knowledge of the owner of the Management Right and the consideration of the Civil Judge on the Role of the Actor on Land Deed in the sale and purchase of flats that are built on the right to build on the Above Management Rights. The research method in preparing this thesis emphasize the type of Normative Law research because this research does not involve field research but in literature. The results that author find in this study found out that the extension of building rights above Management Right must be carried out with the knowledge and permission of the holder of Management Rights (DKI Provincial Government). Because if not, the extension will be considered illegal or null and void by the law and the role of the land deeds official is required to examine the certificate held by the Right Building Holder can held the accurate data and can facilitate the extension of the Right to Build on Management Rights.