The office towers had sold at a yield of 7.25 per cent.
"In Hong Kong and Singapore, prime properties change hands at yields as low as 2.5 to 3 per cent," Mr Richards said.
"Prime yields in Sydney have recently fallen as low as 5.2 per cent."
Shortland Management, which manages Shortland Trust, said it would continue to oversee the buildings until the end of the year.
Nadeem Ali, chief financial officer of Shortland Management, said the organisation wanted to create a stable, long-term client base within the buildings it managed.
"The new owners have indicated their desire to take a similar long-term approach."
News of the sale had contributed to a decision to put the General Building at 29-33 Shortland St on the market, she said.
The building, which accommodates a number of well-established professional businesses, brings in $1.77 million in rent each year and is also owned by the trust.
Read more:
• Trio of CBD towers fetches $65m