In Compliance Stories, a 13-story mixed-use mass timber building recently constructed in Amsterdam, is designed with a single exit stair. While the single-stair concept is attracting supporters in the United States-where almost all jurisdictions require buildings to have two exit stairs-experts caution that the approach must also address occupant safety in the form of interior compartmentation, noncombustible building materials, and other fire safety measures. 50 | NFPA JOURNAL * FALL 2022 IMAGES COURTESY OLAF GIPSER ARCHITECTS, © MAX HART NIBBRIG