The biggest downtown Miami property owner just added another building to his holdings.

Moishe Mana bought City National Bank's old headquarters just east of the Miami-Dade County civil courthouse for $25 million. The deal closed Tuesday.

Mana, an entrepreneur and developer, has accumulated more than 50 properties that he wants to transform into a global technology hub. His "Silicon Valley of Latin America" would bring together the likes of startups and Blockchain companies from Asia and Latin America and add offerings such as food halls and micro-units.