Events marking Sandy's fourth anniversary are being held throughout the city.

The non-profit Rebuilding Together NYC is helping several homeowners still struggling with the aftermath of Sandy today, offering free repairs to low income families in Gerritsen Beach, Brooklyn.

One woman says without their help, she was desperate. She did not qualify for the city's backlogged Build it Back Program.

"It's a godsend, ever since Rebuild Together had come to the house, and said they were going to help us," said Sandy victim Denise Garrett. "They promised they were not going to leave us stranded any longer and they are here to help. And it's a wonderful, wonderful thing and we are very grateful."

More than 40 people in the city were killed as a result of Sandy, two-dozen of them on Staten Island.

The storm surge and winds destroyed thousands of homes and caused billions of dollars in damage.