SUNNYVALE, CA-Apple Inc. has leased Sunnyvale Research Center, a 224,000-square-foot research park at 1050-1090 E. Arques Ave. in Sunnyvale, for five years.

BUFFALO, NY-Cleveland-based Developer's Diversified Realty Corp. has sold the Seneca Ridge Plaza, a 62,585-square-foot retail plaza in West Seneca.

DUBLIN, CA-Ross Stores Inc. has seized Emerald Point, a three-building office complex in Dublin.

PHOENIX-TriGate Capital LLC, a real estate investment firm based in Dallas, has bought a six-story, 353,823-square-foot retail portfolio in the Phoenix area for an approximated $26.8 million.

COVINGTON, KY-Tier1 Performance Solutions has signed a lease for 10 years with Corporex Cos. for 12,500 square feet of space at RiverCenter in Covington.

ROCKVILLE, MD-Four retail tenants have signed lease deals totaling 16,800 square feet at Rockville Town Square.

TAMPA, FL-Humana Medical Plan Inc. has leased 52,433 square feet of office space at MetWest International in the Westshore submarket of Tampa.

BOSTON-Invesco Real Estate's institutional client has paid $75 million for 179 Lincoln St. in Boston.