As an adult, Van Rensselaer lived in Albany and became a successful businessman and banker. Among his activities, he was the President of the Bank of Albany, a Trustee of
Union College, and a founder of
The Albany Academy. He owned several warehouses, extensive land along Albany's
Hudson River waterfront, and
flour and
plaster mills on the
Normans Kill at the
Bethlehem town line. His mills were destroyed by fire in 1820. In 1793 Van Rensselaer became an
Alderman. He served as Mayor from 1799 to 1816, and was succeeded by
Elisha Jenkins. Van Rensselaer returned to office from 1819 to 1820, and was succeeded by
Charles E. Dudley. During his time as Mayor, a permanent
New York State Capitol building was constructed just in front of the current one, and Van Rensselaer laid the
cornerstone. During his term,
Robert Fulton's steamboat
Clermont arrived in Albany at the end of its first voyage, and
Schenectady County was created from a portion of
Albany County. Van Rensselaer was active as a
Freemason, and served as New York's
Grand Master from 1793 to 1795. ==Personal life==