FCG Wealth Management LLC, a financial planning and investment management firm in Chatham, N.J., is opening a branch office in downtown New York City, the firm announced Thursday.

The new office will be staffed by brother and sister team Christopher J. Mackin, CFP, and Michelle Mackin, financial advisor. The firm, which has $700 million in assets under management, was founded by John Combias.

The Mackins will provide retirement plan consulting for closely held businesses and provide planning services for executives, owners of closely held businesses, families of intergenerational wealth and emerging affluent professionals.