With commercial, you are likely dealing with multiple leases, annual CAM adjustments (common area maintenance costs that tenants are responsible for), more maintenance issues, and public safety concerns.
Time commitment. If you own a commercial retail building with five tenants, or even just a few, you have more to manage than you do with a residential investment. You can't be an absentee landlord and maximize the return on your investment. With commercial, you are likely dealing with multiple leases, annual CAM adjustments (common area maintenance costs that tenants are responsible for), more maintenance issues, and public safety concerns. In a nutshell, you have more to manage; and just as your tenants have to worry about the public eye, you do as well.