I was pleasantly surprised to learn that even though a hotel had no rooms available for points, I could book it for C+P+DSU.
On reading back in this thread, I see that
stargold mentioned this in February.
Originally Posted by stargold
This has the unintended (and potentially lucrative) benefit that some properties will show no base rooms, no C+P, but will allow C+P plus DSU because the suite (and the associated C+P plus DSU) inventory remains available.