Office rental demand from international professional services and financial firms remained weak in the third quarter, a consequence of continued uncertainty in the global and domestic economies, according to a report by commercial real estate services and investment management company Jones Lang LaSalle. Eyeing the large number of lease expirations that are expected for the remainder of the year and into 2014, landlords are eager to lock in tenants to maintain or improve current occupancy levels. Overall, rents in the third quarter fell 0.2 percent quarter-on-quarter, the report showed.