| 1929 | George Lyon becomes President of Central Chevrolet at East 70th and Euclid Ave. |
| 1942 | General Motors makes Lyon and Central Chevrolet the Cadillac distributor Northeast Ohio, selling Cadillacs to customers and other dealers: Central Cadillac is incorporated. |
| 1943 | Lyon opens Central Cadillac dealership at 2040 East 71st Street. |
| 1945 | Frank Porter, Sr. joins Central Cadillac as salesman after serving in World War II. |
| April 29, 1949 | Central Cadillac moves to Carnegie Avenue and opens a new modern building. |
| 1949 | Frank Porter, Sr. becomes General Manager.
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| 1954 | Central Cadillac starts Mobile Home Service, sending mechanics to customers’ homes to service their automobiles. |
| 1959 | Central Cadillac starts Prudential Finance Co., which helps finance cars sold by Central Cadillac as well as other automobile dealers. |
| 1959 | Central Cadillac forms Executive Leasing Corp., offering leases for Cadillacs and other makes and models, both new and used. |
| 1960 | Central Cadillac opens the Coffee Shop, offering breakfast, lunch and snacks to customers while their cars are serviced. |
| 1965 | Cadillac Motor Car eliminates its distributorship system. Central Cadillac stops wholesaling cars to other Cadillac dealers in Northeast Ohio. |
| 1965 | Lyon retires; Frank Porter, Sr. becomes President of Central Cadillac. |
| 1967 | Frank Porter Sr. builds Tower East, a 12-story office building in Shaker Heights, OH designed by Walter Gropius. |
| 1969 | Frank Porter, Jr. and George H.L. Porter join Central Cadillac, bringing a third generation to the family business. |
| 1970 | Central Cadillac is totally updated and remodeled. |
| 1982 | MidTown Cleveland is founded by a group that includes Frank Porter, Jr.; the nonprofit economic development corporation focuses on the revitalization and development of the MidTown Business District. |
| 1985 | Frank Porter Sr. and Jr. build Enterprise Place, a five-story office building in Beachwood, OH. |
| 1994 | Frank Porter, Jr. serves as President of the Greater Cleveland Automobile Dealers Association (CADA), representing new-car dealers in the region. |
| 1999 | Armond Sottosanti, a.k.a. Mr. Cadillac, retires from Central Cadillac for the second time after selling more than 3,000 Cadillacs in 40 years. |
| 1999 | Frank Porter Jr. is appointed Cadillac Dealer of Record by General Motors Corp. |
| April 4, 2001 | Central Cadillac is named the exclusive HUMMER dealer and service center in Northeast Ohio by General Motors and AM General; dealership’s name becomes Central Cadillac-HUMMER. |
| 2002 | Frank Porter Sr. dies at the age of 82. |
| 2003 | Central Cadillac-HUMMER begins a multi-million dollar remodeling and expansion project. |
| 2003 | Cleveland Foundation receives the largest gift in its history – between $60 million and $70 million – from the estate of Mr. and Mrs. Frank Porter, Sr. |
| May 4, 2004 | Central Cadillac-HUMMER celebrates its grand reopening and sports the new design look of Cadillac; marks 55 years since original building's grand opening. |
| August 9, 2005 | Central Cadillac-HUMMER opens state-of-the-art HUMMER dealership in Beachwood, OH. |
| 2008 | Central Cadillac-HUMMER to open a HUMMER dealership on Carnegie Avenue in Cleveland across from the existing dealership. |