The sale is led by Munch's Two Women on the Shore which is valued at around $955,000.
The modestly-priced merchandise sold out in an hour.
Rothko visited the seaside city twice and painted it several times.
Works by Maggie Moran and Emily Murphy were among the 46% of lots selling above their low estimate at Christie's 'Inside Job: Christie's New York Staff Art Show' auction on August 5-19 in New York.
The Netherlands' pavilion in this year's Venice Biennale features daily performances which present a physical challenge.
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