| 1721 | building started on malthouse at Keith's "Fountain Low" |
| 1723 | earliest date for the building of the Keith House |
| 1739 | Dr.Graeme acquires Fountain Low and renames it Graeme Park |
| 1755 | renovations to interior at Graeme Park |
| 1765 | Dr. Graeme retires for health reasons, spends more time at Graeme Park |
| 1772 | Dr. Graeme dies. Elizabeth Graeme Fergusson inherits Graeme Park |
| 1778 | Graeme Park confiscated due to Henry Hugh Fergusson's loyalist sympathies |
| 1781 | Graeme Park returned to Elizabeth |
| 1795 | Dr. William Smith sells Graeme Park property for Elizabeth |
| 1801 | Samuel Penrose buys 300 acres, including Keith House, at Graeme Park |
| 1810 | Penroses build new farmhouses |
| 1920 | Welsh Strawbridge buys Graeme Park from the Penroses |
| 1958 | Strawbridges give Keith Mansion and 42 acres to the Pennsylvania Historical and Museum Commission(PHMC) |
