Absolutely the nicest Carson City I have laid eyes on in my nearly 70 years on this earth. Good for you!
For reasons I have never understood, the cornerstone-layers of many of the older buildings in New York City took literary license and departed from the rules of formal "grading," as it were, preferring to render, 19--, MCM, as MDCCCC, and 90, XC, as LXXXX. The correct rendering, as you've noted, is MCMXCII. (I believe the '07 St. Gauden's Double Eagle also conformed to this scheme, likely for effect.) Nice Barber!