Grosvenor said sales at Liverpool ONE were up 15% in the eight weeks from 7 November to 4 January compared to the same period in 2013.
Sales during Christmas week were up 19% and footfall between Boxing Day and 29 December was 5.4% ahead of 2013, reaching almost 500,000.
Miles Dunnett, director of portfolio management at Grosvenor, said: "This has been our best-ever Christmas, with Liverpool ONE performing significantly ahead of the industry benchmarks for both sales and footfall. Key to our success has been the investment made in our offer, which was boosted by 22 new brands last year, many making their regional debut, and Liverpool ONE's position as so much more than somewhere to shop.
"Liverpool ONE provides inspiration, entertainment and a genuinely warm welcome, all of which consumers are actively seeking as they make ever-more informed choices about how and where to spend their time and money. A key trend this Christmas, this theme is set to remain critical throughout the coming year."
Liverpool ONE footfall reached 27.5 million in 2014, 5% ahead of 2013. Sales for the year were also up, recording a 7% increase compared to 2013.
In 2014 there were 22 new brands signed, including 40,000 sq ft of restaurants, the opening of Zara's new regional flagship, and the first Michael Kors in the North West. Liverpool ONE is 99% let or under offer and 90% of the new stores in the last two years have made their North West debuts in Liverpool ONE.