The deal will be funded via a mix of debt, existing cash and the issuance of new Standard Life ordinary shares to Aegon at completion.
The change widens the scope of the programme so that it covers existing data centres after their first year of operation.
Christopher Filiaggi is due to remain interim CFO until the transaction is completed.
Hamilton Group is a family-run company that has advised small and mid-sized businesses in New Jersey and the wider tri-state area for nearly 70 years.