Long-term and Short-Term Executive Office Space for Rental in Downtown Portland, Maine Executive Office Suite Rentals, Conference Rooms, & Virtual Offices in Portland, Maine Executive Office Centers provides furnished offices, executive office suites, virtual offices, conference room rentals, meeting rooms, and offices with videoconferencing capabilities. We do this at a fraction of the conventional start-up costs of a business. Whether you’ve been in business for 20 years, or are just starting up, our rental office space and professional staff will give you an executive image. Executive Office Centers’ beautifully furnished offices are located in the heart of downtown Portland, Maine and offer privacy and comfort (and great views!).