They were needed to provide extra width for safety and for stopping bays which would enable buses to pass each other.
Although some properties would be sold again, more acquisitions were needed, particularly in Dominion Rd's southern sector between the Mt Roskill shopping centre and State Highway 20, where there was only a small section of bus lane.
That was a serious bottleneck in morning and evening travel peaks, preventing buses from getting through congested traffic.
But Mr Walden said the $48 million budgeted for property purchases would be scaled back to about $26 million.
About $20 million has already been spent buying properties, including for abandoned bus loop proposals behind the Valley Rd and Balmoral Rd shopping centres.
There was no intention to retain properties back from Dominion Rd, and his organisation would work with the Auckland Council on what to do about them.
"We are not doing it unilaterally," he assured the committee.
That followed advice from councillor Cathy Casey that the council was keen for all titles to be assessed by its property subsidiary for the possible provision of affordable housing.
Mr Walden said all his organisation wanted from most properties was a couple of metres from their frontages. In some cases where entire properties had been bought, Auckland Transport would sell back what it didn't want.
But some committee members remained wary of the council-controlled organisation's intentions.
Council heritage forum chairwoman Sandra Coney said the viability of the village centres along the route was important.
"We want to ensure we don't transform the character of Dominion Rd," she said.
"We don't want to make everything fit for purpose for peak times but leave it lacking in character and personality and vitality the rest of the time."