Yes, 'that' is a relative pronoun. Notice that it is omitted along with 'are', however, to form an absolute clause. This is a different process than the optional omission of 'that' alone.
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blewinFlats (that are) illegally partitioned into residential cubicles are notorious for their poor living conditions.Is "that" a relative pronoun? but I thought we can only omit it if it is the object of the sentence.like - The man I met is John.so what is this "that"?thanks for the help!"That" is a relative pronoun. It is fine to omit it.