Some academics might question the use of "which" (instead of "that") in restrictive relative clauses, but many others also accept it. Yes, the "that" clause refers to the buildings. If it referred to the style, it would be 'a modern style that resembles building'.
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vcoltsSo basically, "S" is the only way to differentiate the two, right?Right. You are lucky that they are not both of the same number: