Glenn Shewan of Bell Gully was listed as the lawyer involved.
Auckland Council lists 66 Wyndham St as being valued at $120m: $50m land and $70m building.
The purchase had to go to the OIO because it involved the sale of "significant business assets". Purchases of assets in this country valued at more than $100m go before the OIO.
"The application intends to continue leasing the land to tenants as a commercial and retail space," the OIO said of the Chorus House sale.
Invesco says it is in 25 countries, manages assets of more than US$975.2 billion and has more than 7000 employees.
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$247m sale, major leasing: Mansons secure year's top deal to date after Kiwibank, Southern Cross take space
But a larger Auckland office block sale has been made already this year.
New Zealand's largest private developers, the Auckland-based family-owned real estate specialist Mansons TCLM, leased then sold a partly-built city office block for more than $247m.
Culum Manson said the business had sold 155 Fanshawe St, new commercial premises on the ex-Caltex service station near the Halsey St corner in the Wynyard Quarter opposite Victoria Park.
The sale to an overseas pension fund came after leasing that building as Kiwibank's new Auckland headquarters and to insurer Southern Cross, Manson announced on March 11.