In 2014, she became the president of the Alliance for Downtown New York, a Business Improvement District.

On February 3, 2014, Lappin was appointed as president at the Alliance for Downtown New York, the organization that manages the Downtown-Lower Manhattan Business Improvement District.

[1] Lappin also serves as the President of its sister organization, the Downtown-Lower Manhattan Association.

Lappin served two terms as a member of the New York City Council, representing Manhattan's fifth district, which includes the Upper East Side, East Midtown, and Roosevelt Island.

She also ran in the Democratic Primary for Manhattan Borough President in 2013 and finished in second place.