The fund has been in the market since July 2016.
Avista IV will invest solely in healthcare assets.
The firm is looking to hold a first close in July, Secondaries Investor has learned.
The Blackstone unit expects to take advantage of a rise in dealflow from mature assets.
The secondaries firm expects to wrap up fundraising by the end of the year for its latest real estate secondaries vehicle, according to Connecticut's pension plan.
The investment manager's latest secondaries vehicle is seeking 60% more than the target of its predecessor 2012-vintage fund.
ATRS backed Landmark because it 'quietly goes about its business with skill', according to the pension's executive director.
As much as 30% of the fund will be invested in secondaries and direct co-investments.
PE-Invest 3 will invest globally in private equity funds as well as secondaries and direct investments.
The firm expects to hold the final close by the end of June, Secondaries Investor has learned.
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