4 injured at mansionmansion in case of fires.But Glasson said the firemen had to enter the building Saturday night to make sure no juveniles were lying injured somewhere inthe building.Apparently the main roadblock standing in the way of getting the fence is lack of agreement between the commissioners and Conservancy on what the renovat-ed Bolton Mansion will be used for.Pierson yesterday said the renovated building could be used both as a museum and also as rented professional offices.“In order to maintain the mansion we would need some income,” Pierson saidBut Commissioners Earl Dougherty (D-5) and James Aich-ele (D~8) already have said they oppose a commercial use of the Bolton Mansion.Bolton Mansion, once the home of Phineas Pemberton, an associate of William Penn, had been set for demolition a short while ago.But the commissioners postponed the demolition when the Conservancy said it could provide fencing and other safety measures to prevent further vandalism at the mansion