Normally standard lease period in commercial office space scenario is 9 years with 3-5 years of lock-in period with 15-20% escalation clause every three years. Usually ready to move in property where tenant is already occupied the space are considered pre rented properties but now a days under construction projects which has already signed verified lease with the potential tenants is also termed as pre-leased property. Pre rented commercial property is considered safest investment options in real estate segment as there is hardly any risk regarding your hard-earned money as property is already in physical form.
Usually ROI in commercial property (i.e. 6%-8%) is higher compared to residential pre-leased and commercial property tends to appreciate more in long run than residential properties.