Families have moved out of their homes at the site.
Residents living near the scene of a coastal landslip say they are desperate to find the cause of the slide which has been claiming homes and gardens.
Demolition has already begun on a row of houses left teetering on a cliff edge at Knipe Point near Scarborough.
Bulldozers moved in after residents were told to leave their homes overlooking Cayton Bay in North Yorks.
Residents Association chairman David Stothard said the landslip had "come out of the blue."
Mr Stothard said: "The development of the site started about 25 to 30 years ago, and in that time the movement of the cliff edge has been minimal.
"It hasn't been a cause for concern at all, in fact when consultants looked at the coast strategy for Scarborough Council they didn't flag up land slippage at Knipe Point as an issue at all.
"They flagged up one or two coastal issues, but nothing about landslip, so this has come out of the blue."
People were told to leave after gardens and patios crumbled and fell 100ft (30.4m) below the houses which are built on National Trust land.
The National Trust said it was investigating why the land has slipped.
Two homes have already been demolished before the land below them crumbled way.