I think this infomation from the UK Land Registry might help you.

Grundbuch is usually the land register, but for flats the normal forms of registration are Commonhold and Leasehold

See under practice / commonhold for more information

From Wikipedia, the free encyclopedia
This article is about the form of housing. For the international law describing a territory in which two sovereign powers have equal rights, see Condominium (international law).
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A condominium, or condo, is the form of housing tenure and other real property where a specified part of a piece of real estate (usually of an apartment house) is individually owned while use of and access to common facilities in the piece such as hallways, heating system, elevators, exterior areas is executed under legal rights associated with the individual ownership and controlled by the association of owners that jointly represent ownership of the whole piece.

Colloquially, the term is often used to refer to the unit itself in place of the word "apartment". A condominium may be simply defined as an "apartment" that the resident "owns" as opposed to rents.

Condominium is the legal term used in the United States and in most provinces of Canada. In Australia and the Canadian province of British Columbia it is referred to as strata title. In Quebec the term "divided co-property" (French: co-propriété divisée) is used, although the colloquial name remains 'condominium'. In France the equivalent is called copropriété (co-ownership), usually managed by the syndic. In New Zealand an "apartment" refers to a unit that is owned, while a rented unit is referred to as a "flat". In South Africa, this form of ownership is called Sectional Title, with the owners constituting the Body Corporate.[1]