Riteish, who was at an Expo in Milan, took to micro-blogging site Twitter to share the news with his fans.
He tweeted: "Excited to Design a new project. - Detailing is everything. (sic)"
"Last day at the Milan Expo- enjoy being an architect- thrilled to see innovation in design here," added the actor, known for films like "Masti", "Kyaa Kool Hai Hum" and "Housefull".