The boss of the i360 viewing platform in Brighton and Hove, UK, has relinquished her position in charge. However, Eleanor Harris has said she will remain a shareholder of the project.
The tourist attraction opened earlier this summer and has already welcomed its 100,000th visitor.
Ms Harris said: "The last 10 years of my life have been devoted to delivering this wonderful world-class tourist attraction.
"This is the longest time I have spent on any project, and I now feel it is time to move back to running my own visitor attraction consulting firm, I-Xperience.
"British Airways i360 has been an amazing attraction to open. High points for me have included assisting with securing planning consent in 2006 and the funding in 2014; and bringing in BA as a sponsor in 2015.
"It was incredible to launch the attraction and to welcome our 100,000th visitor through the door after just a few weeks.
"I have recruited a fantastic team and when I step away I am confident that I will leave the attraction in good hands.”