The oval office is going to be under security upgrade renovations for a year thanks to the kenyan dumping it on President Trump.
Yes, this might have had in impact on the Trumps' decision.
Reportedly it will to be a very serious, heavy-duty renovation. I wonder if there are other areas of the WH that will also be disturbed that we're not hearing about.
When Truman ordered the WH gutted in the '50s, allegedly for installation of modern wiring, better security etc, the Truman family lived in Blair House for quite a long time, I believe.