Meanwhile, smoke that could be seen for miles spewed from the building.
Firefighters reportedly had to use tankers to get water to fight the fire.
No injuries were immediately reported.
Greenwich mansion goes up in flames
GREENWICH Eyewitness News is told the sprawling house erupted in flames on North Porchuck Road just after 4:30 a.m. Heavy flames shot through the structure, located in the backcountry section.
