Houston is globally important for its oil and natural gas industry, but it’s also popular with other businesses. The city’s service sectors are expanding, particularly financial, legal and management firms, plus scientific and technical companies. It is the home of the Texas Medical Center – the world's largest concentration of healthcare and research institutions – and also NASA's Johnson Space Center. The city is a corporate center, rivalling New York City for the number of Fortune 500 headquarters based within its boundaries. Houston’s port is one of the world’s most important for imports and exports. Interstate highways link the Houston with Fort Worth/Dallas and other major US cities and the city is served by three airports. Our network of business centers in Houston is unmatched, with every kind of office on offer in every type of location from the central business district to the Energy Corridor west of the city. As well as being home to major national and international corporations, Houston encourages small businesses. All sizes of company are catered for in our centers. In addition to modern offices that are ready to move into given a day’s notice, we offer virtual office addresses, call handling and mail handling. Our facilities include business lounges where you can drop in and work in a professional environment, meeting rooms and high-speed internet access. Many have Wi-Fi, state-of-the-art video communications and business cafes.