3. Use Google Earth. I then remembered that Google Earth ALSO has a 3D model of the earth, and what's more, it shows you the elevation of the point you've selected at the bottom of the page! Here you can see the exact location of our lat/long point (in the middle of the umbrellas and tables set out for lunchtime. (The white lines are big, decorative beams, one of which is shown in the picture at the top of this post.) And, as you can see, Earth puts the elevation at 13 feet.
That's encouraging, but don't stop searching just because you found an answer you like!
which suggests that it will be underwater. (The photoimagery illustrates the part that would be submerged, including the Plex. The part that's white is still high-and-dry.)