Mid-Manhattan Real Estate Group, LLC has signed a long-term lease for 8,000 s/f on part of the sixth floor at 800 Second Ave., according to NAI Global New York City. The investment firm will occupy the space with executive offices and medical services. The tenant was represented by Gil Robinov, executive managing director of NAI Global's New York City office. NAI Global's New York City office is wholly owned by NAI Global, one of the leading commercial real estate services providers worldwide. They are headquartered in Princeton, N.J. NAI Global manages a network of 5,000 commercial real estate professionals and 325 offices in over 55 countries, and completes over $45 billion in annual transaction volume. Since 1978, NAI Global clients have built their businesses on the power of NAI's expanding network. NAI Global's extensive services include corporate real estate services, brokerage and leasing, property and facilities management, real estate investment and capital market services, due diligence, global supply chain consulting and related advisory services. To learn more, visit www.naiglobal.com or www.nainyc.com .