Peterken says it was purchased by a Singapore-based investor.
"Offshore investors, particularly from Australia or Asia, are continuing to seek quality Auckland CBD properties, especially as pricing becomes more competitive in Sydney and Melbourne," he adds.
"Having new groups like the purchaser of 75 K'Rd, Blackstone and ICD Property investing into New Zealand commercial property tells a really positive story about the ongoing stability of New Zealand's economy.
"This trend looks set to continue, with new offshore buyers behind several other major transactions that are yet to be announced."
As Peterken and Seymour see it, increased buyer demand from offshore has created opportunities for Colliers to leverage its international networks to conclude such transactions.
"The fact that the buyers of both the Federal Street Car Park and 75 K'Road have not previously invested here illustrates why marketing campaigns for major real estate assets in the current market must have international reach," says Peterken.
Colliers' Richard Kirke says offshore investors are attracted to New Zealand's enviable economic growth.
"The economy's success has been driven by strong migration-led population growth and a booming tourism sector, underpinned by the growth in construction of housing, infrastructure and commercial industry.
"The domestic outlook continues to look robust, with the OECD projecting solid growth of 3 per cent in 2018 and 2019.
"We are seeing unprecedented levels of new offshore interest in our major cities, and particularly in Auckland, where demand for large, high-quality investment and development opportunities is particularly high."
Seymour says Auckland is the powerhouse of New Zealand's economy, making it especially attractive to investors.
"Auckland's economy has grown by 22 per cent in the last decade, reaching a record $83 billion in 2017.
"The city now contributes close to 40 per cent of New Zealand's total economic output, ahead of Wellington and Canterbury at 13 per cent each.
"Population growth, booming visitor numbers and a strong construction pipeline, especially for housing, continue to drive Auckland's growth."
Seymour says the recently sold property at 75 Karangahape Rd made for an appealing investment due to its fringe CBD location within Auckland's education precinct.
"The property also has strong tenant covenant from two well-established tertiary education providers on long-terms leases.
"Tertiary education investments are globally sought after in the current market. The sale of 75 K'Road shows commercial property investors continue to see value in the sector in New Zealand.
"Strong tenant covenant is a key consideration for investors here. Large, established tertiary education providers in particular will continue to be attractive as tenants."
Seymour, together with Colliers' Peter Herdson, also brokered the sale of the Federal Street Car Park on behalf of SkyCity.
"This transaction, at $24,375 per sqm of land or nearly $94,000 per car parking space, illustrates the confidence and potential for growth overseas investors and developers have in our market."