Four more tenants are opening offices in the Wrigley Building, leasing a combined 14,700 square feet, according to a statement from the property's owner, a venture that includes Chicago-based firms BDT Capital Partners and Zeller Realty Group. In the biggest deal, Wendella Sightseeing leased 6,919 square feet, according to the statement. Tapad, an advertising and marketing firm based in New York, leased 2,762 square feet; it was represented by CBRE. TelAmerica Media signed a lease for 3,032 square feet and was represented by Chicago Tenant Advisors. Willoughby Engineering inked a deal for 1,975 square feet and was represented by J Rich Co. “We continue to see a great acceptance and reaction from smaller tenants for what the buildings are and what type of space you can create,” said Zeller Principal Ari Glass. Office space in the building at 400-410 N. Michigan Ave. is now 59 percent leased, he said.