. under the terms of the 2005 outperformance plan , all ltip units that were earned remained subject to time- based vesting , with one- third of the ltip units earned vested on each of november a030 , 2008 and the first two anniversaries thereafter based on continued employment . the earned ltip units received regular quarterly distributions on a per unit basis equal to the dividends per share paid on our common stock , whether or not they were vested