The Lower Manhattan Development Corp. has failed to make the most basic security modifications to a firehouse near the former Deutsche Bank building three months after an accident injured two firefighters.

After a 22-foot pipe fell from the building and crashed through the roof of the firehouse, the Lower Manhattan Development Corp. agreed to install protective scaffolding on the roof of the firehouse. The work was never done. A spokeswoman for the Department of Buildings, Kate Lindquist, said the agreement was made in late May between the LMDC, the Department of Buildings, and the fire department.

A spokesman for the LMDC, Errol Cockfield, said the work was schedule to begin this week, but has been delayed.

A fire on Saturday at the building, which is owned by the LMDC, left two firefighters dead. Another two firefighters were injured yesterday after a piece of equipment fell from the building.

Mr. Cockfield said finding a contractor to install the protective scaffolding, which is stronger than normal scaffolding, is difficult and expensive. He said he could not immediately provide the name of the contractor or the cost of the project.

“LMDC took the time necessary to find a contractor that would construct protections on the firehouse to meet the highest standard,” Mr. Cockfield said.

On May 31, the Department of Buildings issued a violation against the contractor on the demolition project, Bovis Lend Lease, because the protective scaffolding had not been put up. The contractor was not fined.

The chairwoman of the quality of life committee for Community Board 1, Patricia Moore, said the protective scaffolding should have been erected.

“If you agree to do something, you should do it,” she said. Ms. Moore, who lives with her husband in an apartment next to the firehouse, said she is concerned that a pipe “could have just as easily propelled itself through our window and killed us while we were asleep.”

She said the LMDC is responsible for “anything that happened and anything that continues to happen,” during the demolition of the building. “The buck should stop with them,” she said.

The chairwoman of Community Board 1 in Lower Manhattan, Julie Menin, said protective scaffolding must be erected to protect the firefighters and the neighborhood.

The LMDC, a state agency created after the September 11, 2001, terrorist attacks to help rebuild and revitalize Lower Manhattan, has been preparing to shut down, announcing last summer that it would soon go out of business. It is in charge of creating a permanent memorial to those killed on September 11 and is responsible for the demolition of the former Deutsche Bank building.

A City Council member of Lower Manhattan, Alan Gerson, said yesterday he was unaware that the LMDC had agreed to place scaffolding on top of the firehouse, but added that erecting scaffolding or another type of protection from falling objects was on the “short list of immediate concerns” he and others put together the night after the fire.