A first-alarm fire tore through a vacant three-story brick building in the 3900 block of North 21st Street in St. Louis on Friday, pushing firefighters to pull back, order an evacuation and switch to a defensive attack. Flames were reported heavy on the first and second floors, and as conditions inside went downhill, crews shifted operations outside. Fire officials said there were no injuries and confirmed that all personnel were accounted for at the scene.
Video posted by St. Louis Fire Department shows Battalion 1 in command and Engine Company 8 as the first-due unit. Crews initially stretched a single attack line, then brought in an aerial waterway along with three hand lines while working to protect a nearby building on side B. Battalion 1 ordered the structure evacuated as fire spread rapidly and structural conditions deteriorated, and the department reported that all members were accounted for at the scene.
Why Vacant Buildings Are a Hazard
St. Louis continues to wrestle with a huge stock of derelict properties, with roughly 25,000 vacant parcels citywide, including about 8,000 vacant buildings. Those empty structures are involved in a disproportionate share of fire responses, according to city officials and local reporting, and the risks are far from theoretical. In St. Louis and other cities, fires in abandoned buildings can move quickly and behave unpredictably, and NIOSH investigations along with local coverage have flagged those conditions as contributors to firefighter injuries and deaths, including the 2022 collapse that killed Firefighter Benjamin Polson. The City of St. Louis has documented the vacancy figures, while Firehouse has detailed the NIOSH findings on the fatal collapse.
At the Scene
As the blaze intensified, crews transitioned fully to a defensive posture, operating outside the collapse zone and pouring water from the aerial waterway and multiple hand lines while shielding neighboring structures. Battalion 1 ordered all firefighters out as interior conditions worsened, and companies were positioned on side B to keep flames from spreading to adjacent properties. According to the St. Louis Fire Department, firefighters reported no injuries and confirmed that every member was successfully accounted for.
What Comes Next
Fire investigators and the city’s Building Division are expected to sort out the cause and decide whether the damaged structure will need to be demolished or secured. The city already runs programs aimed at tearing down dangerous vacant buildings and steering money toward demolition and remediation, part of ongoing efforts to shrink the backlog of empty, unsafe properties. The City of St. Louis has outlined those vacancy-reduction and demolition plans in recent reports.
The scene remained active into the evening while crews and inspectors worked the site. Officials have not released a cause, and further details are expected as the investigation continues.
