A question for MFU-NCIS Tuesday

We know much of MFU was filmed on the MGM backlots; even the exterior of the building where the dressing rooms were located was used as a site.  Since this is Tuesday, I have a question about sets and props.

I recognized a few props and sets recently while I was watching the movie, "High Society":
the white staircase from the Dexter-Haven's house;
the red chairs with gold fringe in the Dexter-Haven's house;
the statues from the grounds at Tracey Lord's house; 
the front exterior of Tracey Lord's house;
the unpaved drive at Tracey Lord's house (best used when Waverly, decked out with those sharp-looking driving goggles, kicked up some dust in "Her Master's Voice");
and a section of Uncle Willie's bar - it looks like it was converted into Miss Diketon's "toy" display in "Concrete Overcoat".

The steamboat from "Showboat" served as a vantage point for Napoleon at the beginning of "Hong Kong Shilling".

The New York brownstone set (with DelFloria's Tailor Shop) was used in "Singing in the Rain".  Gene Kelly danced his way down an adjacent side street.  After the May 1967 fire on Lot 3 that affected the New York set, part of the burned out set was used as the abandoned warehouse site in "Deadly Quest".

In addition to the MGM movie sets, lots of stock footage was used to establish locales.  The exterior of Biltmore House in Asheville, N. C., was used in both "High Society" and MFU.

What props or sets have you identified from MGM film history or from stock film, cousins?  I'd love to know where I've seen the ornate wooden staircase used in "Double Affair", "Bow-Wow", and "Secret Sceptre".  I've puzzled through several 1930's-1950's films, and I can't place it. 

Cat