No, the agent is referring to the deadline from last years budget that restricts the Section 23 relief. For buildings that are not complete by end Dec 2006, the relief is reduced to 75% (then 50% next year).
But I'm still not sure how you signing contracts will allow the building to be completed by Dec 31st. As last poster says the relief only starts when the property is first let.
So, the real issue is, will the building be complete by Dec 31st, and will it be certified by the Revenue by then. It doesn't matter when you buy the apartment other than obviously you won't get the relief till next year if you don't sign till then.
So, you signing by Christmas is irrelevant to the Section 23 relief - unless you need relief in 2006.