I don't know if this helps or if it adds to the confusion. In Brazil a "manzana" is a 'bloco", in Brasilia they have "superblocos", Indicating a compound of buildings which would conform a block in other more traditional cities.
I like your sense of humor, Masood. Of course, you could always say a superblock is where Superman lives...
divina, I agree, "superblock" is the term to use.
sjunaz, a neighborhood can contain several superblocks; in such a neighborhood, an address could be: neighborhood name, sector (name or number), superblock (usually number), block (letter or number), street (number, letter, or name), house number. Sometimes another datum in such an address is Peatonal number (Walkway? no vehicle access, pedestrians only).
A supermanzana is a block within a residential complex crossed only by inner roads for residents. The term is used in very few cases. It is not a generic word since only few complexes use that name, and I would say most of the people here don't know exactly what it means.
Within complexes, we use bloques instead of manzanas. I suppose supermanzana is a large block (bloque) of buildings.