The Ford -- reported stolen out of Easton, PA -- sped down West Broadway before crashing into Morningside Greenhouse at the five-points corner at Central Avenue at 6:20 a.m.
Co-owner Tara Fisher, who lives upstairs, said she shouted at the fleeing suspects after being roused from sleep, then tried chasing them.
A police investigation was continuing, said Lt. Chris LeMay.
Now in its third generation, Morningside has been a family-owned business since 1935.
"WE ARE OPEN! We are all ok.. thank god!!" the Fisher family posted on Facebook shortly before 12:30 p.m.
More details were expected, they wrote, adding: "It's a bit crazy here right now."
Workers shored up the stone- and brick-faced building.
Meanwhile, police who are investigating the crash reviewed a neighbor's security video.
PHOTOS: Al Gasparini
Click here to follow Daily Voice Paramus and receive free news updates.