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The demolition of the top floor alone is expected to take several days, as crews remove bricks by hand.

An exterior wall of the building located at 241 Carroll Street in Carroll Gardens came crashing down early Monday morning.

No one was hurt.

The fire department has said the building, which dates back to the 1800s, crumbled because of age and deterioration.

The Buildings Department says its investigators are still looking into a cause.

News of the collapse has residents of similiar brownstones worried.

"With any older building you wonder if it's reinforced or if it needs to be inspected to see if it needs to be reinforced," said one neighbor.

"They're doing construction next door to our building so we probably will make sure they're doing everything by the book and its probably worth checking our insurance policy to make sure we are covered if it should happen. It's on my mind," said another neighbor.

The 13 people who lived inside the building have been displaced along with residents in adjacent buildings.

Officials say construction on the building was supposed to begin this week on the very side that collapsed.

Buildings Department records show the structure had no open complaints or violations.