The Beacon will be the biggest shopping mall on the sideline of Nairobi CBD.
The firm has acquired land worth Sh10 billion to facilitate its property development initiatives.
The Sh6.2 billion facility will offer a floor space of 50,000 square metres in three units.
This is the first major revamp by Sarit Centre since its inauguration in 1984.
Stakeholders have reportedly identified Kula Mawe as the best site for the project.
Dunhill Towers is East Africa's first building assessed under the Green Star TM-Africa tool.
Africa is undertaking key projects to support its rising population.
Tower One is owned by the Gilanis group of companies.
The building will be taller than the recently completed 163-metres-high UAP Tower.
The mall offers a mix of local and global retail outlets including Carrefour.
Move signals a strategic push into high-growth, technology-driven markets.
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WSP highlighted that the deal would open “potential cross-selling opportunities”.