Six adults and one child were in the block in the west end of Glasgow where the drama unfolded early yesterday morning.
Fire crews were called to investigate after a friend of a resident reported the collapse at 2.25am at the property in La Crosse Terrace, Kelvinbridge.
They advised the residents to stay in their homes while fire officers met with council officials. They decided the stairs were too unsafe to use and residents had to be evacuated.
Two women and one man were rescued from a third-floor window by fire officers using a high-reach aerial rescue pump. A third woman was rescued by ladder.
The building was cordoned off and a sign above the door warned that the building was unsafe.
A piece of stone staircase could be seen lying on the pavement and workers were using scaffolding to secure the staircase inside.
A council spokesman said all the residents have found alternative accommodation.
A Glasgow City Council spokesman said: "On the evening of September 8, the close staircase began to fall away in this tenement. As a result, the residents were evacuated and the building and staircase is now propped up and has been deemed a dangerous building."
A spokesman for Scottish Fire and Rescue said: "At 2.25am on Monday a call came through that a staircase had collapsed between the first and second floor.
"Two crews from Maryhill were dispatched to investigate. Residents were advised to stay in their homes, near to the rear of the building.
"Following a meeting yesterday, it was decided residents had no use of the stairs and preparations were made to remove occupants safely."