Just spotted this on Facebook!
HEY SYDNEY! From Monday to Friday this week (1st - 5th March), some of our fantastic venues at the 52 Martin Place Food Court will have 50% off lunch between 11:00am and 2:30pm when you order through Hey You.
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For T&Cs and participating venues: https://info.heyyou.com.au/blog/50offmpmarch-2021