Villa de Luna CT: +25 (29) + Aura
CrTe 40, R: Touch D: Moon T: Individual (+3 Size) +2 elaborate
This would be a moon duration building, a decent sized villa or manor. This version creates exactly and specifically one building design each time it is cast, but it is elaborate and impressive.
(There's an extra +1 complexity there, putting it somewhere between CtMT's +3 for free design specs @ time of casting, and the +1 for no finesse roll. What that extra magnitude does -- whether that makes it just extra impressive, or if it allows, for example, a few different, pre-designed options, is still up for discussion.)
~blink~ Really? You realize this gig is magically enhanced manual labor, right? It's a 4-person quarry team, however nifty the magic. Plus, it's a job with no end in site. We're basically creating yet another cottage industry of stone production.