Residents of an apartment block in the inner-Sydney suburb of Mascot have been evacuated because of "identifiable movements in the basement area" of the building, Fire and Rescue NSW said.

More than 90 units in a Mascot apartment building have been evacuated. Credit:Ben Rushton

A spokesman said there were “signs of a problem” with the structure at Mascot Tower - on Bourke Street, near Church Avenue- and engineers deemed it necessary to evacuate about 96 units.

Emergency services were called as a precaution. There were no signs of any "immediate structural failures", the spokesman said.

Fire officer assistant commissioner of operational capability Roger Mentha, said residents could expect to be out of their homes for a couple of days.