Median sales price slipped year over year for Co-Op the fourth straight quarter, down 0.4% to $1,150,000, a diminishing rate of decline throughout 2023. However, the median sales price remained 12.2% higher than the pre-pandemic level. The average price per square foot slipped 1.6% to $1,592 from the year-ago quarter, the first time this metric slipped below the $1,600…