In a letter sent to Gov. Andrew Cuomo, MTA Chairman Joe Lhota officially resigned effective Dec. 31.

He is expected to be exploring a run for New York City mayor as a Republican.

The letter to Cuomo is short and to the point.

UPDATE: We’ve now also posted Lhota’s statement, in which he says it has been a “privilege” to serve Cuomo, who appointed the former Giuliani administration official to the MTA post in October 2011.

Lhota also expressed “gratitude to the entire MTA workforce” for their hard work on bringing back the significantly impacted mass transit system after Hurricane Sandy.

Andrew Hawkins notes one accomplishment that has so far eluded Lhota is a contract deal with the TWU, although he does have 13 more days in which to forge one.

Lhota Resignation Letter (2)

Statement From Joseph J. Lhota