During the past 30 years, J.B. Brown has gradually converted its original holdings to different uses in order to participate in the changing dynamic of the city. Originally located primarily on the waterfront, with extensive office buildings on Middle Street and Congress Street, the company has added properties on the city’s perimeter, and the Maine Mall area while divesting itself of residential properties in the West End.

J.B. Brown today remains one of the largest property owners in greater Portland as it has for the past 125 years. Its properties include six office buildings with total space of 275,000 square feet, nine warehouses covering 850,000 square feet, and seven mixed-use properties combining 220,000 square feet of office, distribution and manufacturing space. Over the last five years, the company’s projects have ranged from renovating a 30,000 s.f. warehouse for offices, to constructing a 27,600 s.f. class 'A' office building at its 100,000 s.f. Washington Park property. The two most recent acquisitions are a 34,000 flex-office building on the Portland-Westbrook line and a 48,000 s.f. administrative office building in the Maine Mall area. Additionally, the Company has recently developed a retail complex in Falmouth, Maine with tenants including:  Key Bank, Starbucks Coffee and Casco Bay EyeCare. Major tenants include L. L. Bean, Maine Medical Center, Sappi Fine Paper, Martin's Point Health Care, Inc., Andover College, Home Health Services of Southern Maine, Time Warner and J. B. Brown's distribution affiliate, Fore River Warehousing and Storage Co.

J.B. Brown began as a family-owned company, and remains privately held, with a large percentage of its ownership retained by descendants of its founder.