Students from six schools created their own special artefacts for inclusion in a time capsule as part of the Centre Square Grade A office project.
The ultra-modern buildings are being delivered in phases, with construction well advanced on the first two, with three more in the pipeline.
And this week the students were invited to present their artefacts at a special event in Centre Square hosted by Middlesbrough Council, developer Ashall Projects and contractor Bowmer & Kirkland.
Pieces donated by the schools:
Archibald Primary School
Beech Grove Primary School
Reading keys symbolising the children's key to success
North Ormesby Primary School
A full school photograph along with their Tim Badge which awards students Star of the Week
Outwood Acklam Academy
School pledge booklet and pledge badge
St Edward's RC Primary School
A prayer for the community written by the children
Unity City Academy
Messages in a bottle from students on why they love their school
Beech Grove Primary Deputy Headteacher Catherine Steel-Brewster said: "At Beech Grove Primary School we unlock the potential of our amazing children and staff to allow them to be the best they can be, so our chosen artefact is a key.
"By working together and nurturing each other's strengths, we know that even a little key can open a heavy door."
Mark Ashall, director of Ashall Projects, said: "Centre Square is one of the most significant development sites in the whole region, and these students will see the area develop and flourish into a central business hub over the next few years.
"Their contributions to the time capsule provide a snapshot of Middlesbrough in 2019 and will intrigue and fascinate whoever discovers them many decades from now."
Kevin Parkes, Middlesbrough Council's Executive Director of Growth and Place, said: "Centre Square symbolises Middlesbrough's ambition and the confidence we have in our future.
"I'm grateful to all the schools who have contributed some truly inspirational artefacts that will be of enormous interest to future generations."