An insulating corner wall form comprises inner and outer foam panels arranged to provide a fixed space therebetween for receiving the poured concrete, the fixed space comprising a corner of about 90 degrees; a plurality of ties connecting the inner and outer panels. The ties comprise first and second corner ties, each extending from a respective first location at the inner panel to a respective second location at the outer panel. Each second location is a distance from a panel corner of the outer panel of from about 20% to about 80% of the thickness of the fixed space between opposite parallel portions of the inner and outer panels.