Engineers working at Spencer Court say the recent wet weather has put their work to the test.
The flats in Newburn were demolished after rain caused a culvert to collapse, washing away the ground underneath.
Boulders put in place to support the construction work are withstanding the current wet weather but there are fears more rainfall may cause flooding.
Site staff say the next 48 hours are critical.
More top news
A man has died after a car was overturned on the A1 this morning.
The Queen's cousin, HRH Princess Katarina, is visiting the North East this weekend and staying in a Newcastle designer's unusual home.
Middlesbrough have slipped from 1st to 3rd in the Championship today.