Kelley owns two other farms in the Lexington area: Bluegrass Hall, a 200-acre property that formerly housed his racing operation, and Hurricane Hall, a 300-acre farm from which he conducted the breeding part of his horse business.
Mr Keenan said up to 10 houses had been evacuated and residents were given shelter in a nearby parish hall during the operation which began at about 20:00 GMT on Tuesday.
Unionist councillors walked out of the City Hall and threatened to withhold co-operation with Sinn Fein by refusing to fill the deputy lord mayor's position.