Moving House Puzzle

The Puzzle:

Moving House
A man who had lived at the highest-numbered address on his street moved to another house on the same street.
He noted that the sum of all the addresses below his new address was the same as the sum of all the addresses above his new address.(Every numbered address on the street is used.)
He had owned some beautiful brass house numbers and was pleased to discover that he did not have to purchase any new ones. For his new house, he used all of the brass numbers from his previous house.
What is his new address?
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