substitute
(2) However—
(a) if the compliance point for noise emitted from a unit is a point in any of the other units in the units plan, the noise standard for the unit is 5dB(A) below the noise standard that would otherwise apply; and
(b) if the compliance point for noise emitted from premises (the 1st premises ) on a territory lease with a common wall with premises on another territory lease (the 2nd premises ) is a point in the 2nd premises, the noise standard for the 1st premises is 5dB(A) below the noise standard that would otherwise apply; and
(c) the noise standard on the boundary between 2 or more noise zones is the average of the noise standards for the noise zones for the time when the noise is emitted, rounded up to the nearest dB(A).