The record date is Dec 31st. But to allow for clearing, the ex-div date is Dec. 27th. The ex-div date is the fist trading day it trades ex/without the dividend. So you have to buy it on the 26th if you want the dividend.
On the 27th it trades EX-dividend, without the dividend, and all open good-til-cancelled orders will be adjusted down by the amount of the dividend at the open on the 27th.
Best to just search "define ex-dividend date" or go to wikipedia and see for yourself.
You have to own it on the 31st ex date to get the div.. You can't buy it on the 31st to get the div. I plan to be out before then as I don't want to own any of the reits after ex's. I will look to get back in a month or so before ex again. Expect to buy in the 19.50-20.00 range. This good stock, just an stuck in a bear market and that div cut won't help pps next year.