The precinct, the borough's fourth, first opened in July and serves a section of the island formerly patrolled by the 120 and 122 precincts. It was introduced to cut the workload of those two station houses.
"Over the past 12 years, we have made historic progress in fighting crime on Staten Island and across the entire city,” Bloomberg said in a statement.
“The new 121st Precinct is designed to meet the needs of the growing borough of Staten Island and is a major investment in continuing to reduce crime.”
The stapler-shaped building at 950 Richmond Ave. was designed to be energy efficient and reduce water use. It's expected to receive LEED Silver certification, a press release said.
The station house has more than 200 uniformed and civilian workers and is led by Deputy Inspector Terence Hurson, formerly the commanding officer in the 94th Precinct in Greenpoint, the release said.
It serves the western and northern parts of Staten Island, including Port Richmond, Mariners Harbor and New Springville.
“With the dedication of the new 121st Precinct station house we demonstrate our resolve to keep the foundation of public safety on Staten Island strong, well into the future,” Kelly said in a statement.