An elevated rental share of multifamily construction is holding typical apartment size below levels seen during the pre-Great Recession period.

According to first quarter 2020 data, the average per unit square footage of multifamily housing construction starts was 1,086, off from the post-recession high set at the start of 2015 (1,247 square feet). The median was 1,031 square feet for the first quarter of the year.

Because the quarterly data are volatile, it is worth examining the numbers on a one-year moving average basis. For the first quarter of 2020, the one-year moving average for multifamily size was 1,102 square feet, while the median was 1,068. The current moving-average of median size is just 1% higher than the post-recession low, while the trailing average is now at a post-recession low. Multifamily unit size may increase in the quarters ahead, as a market response to the coronavirus recession.

The market share of rental multifamily construction starts held steady at 94% during the first quarter of 2020. In contrast, the historical low share of 47% was set during the third quarter of 2005, during the condo building boom. An average share of 80% was registered during the 1980-2002 period. There were only 27,000 multifamily condo units that started construction over the last year.