Are architects interested in making floating buildings through levitation?

Yes, though it might depend on the definition you’re using for levitation.

We float a structure on a liquid like a boat, but I don’t think this is what you mean.

Or in a gas like a balloon, but again this requires huge gas bags for buoyancy which will quickly limit your weight.

Magnets and electromagnets would require unbelievable amounts of power to levitate more than a fraction of an inch.

This leaves us with some “non-visible” force applying material like a gas jet or jet engine. Again, the power requirement is massive compared with the result.

After all this, this is why it isn’t really sought after beyond optical tricks to make things look like they levitate.