The 2019 market for Manhattan residential real estate was one of the worst in nearly a decade, data show, with some brokers walking away from their jobs because of a sales slump.

Sales of existing Manhattan apartments this year fell to the slowest pace since 2011, according to a Wall Street Journal analysis of city property records.

Overall apartment prices tumbled to a four-year low in the third quarter, and remained at the same low levels in the fourth quarter.

The slumping resales make up 80% of transactions in Manhattan and are at the heart of the brokerage business for many New York brokers. New condo sales rose sharply as buildings were completed, but many of those sales went into contract years ago.

“It was a difficult year and one of the most difficult years of my career,” said Leonard Steinberg, a broker at Compass with $3 billion in sales.