Real Estate Brokerage, Property Management, Consulting and Group Investment NAI Advent is a full service real estate firm located in Calgary, Alberta, Canada. Our Company offers a complete range of real estate services including buying and selling, leasing, development, group investment and property management services. NAI Advent takes a unique project-driven approach to real estate which encourages a more strategic and comprehensive focus than just buying, selling or leasing. Our knowledgeable professionals offer extensive experience in their disciplines and a proven track record of successful commercial real estate projects.