For at least two weeks, some residents of downtown St. Paul have noticed that the iconic First National Bank sign isn’t fully lit.

The giant three-sided “1st” sign — a staple in paintings and pictures of the downtown skyline at night — has been malfunctioning, and executives with the commercial real estate firm Madison Equities have been hard-pressed to respond to calls and complaints. The south face is completely dark. The other faces appear to be more reliable.

The sign, which was renovated in 2016 from neon to LED lighting after suffering wind damage, is about 50 feet tall and can change colors.

“People love that sign, so it’s really hard,” said Madison Equities representative Lacy Hanson. “We can’t just crawl up there and screw in a light bulb.”

Bryan Larson, another representative of Madison Equities, said the company has reached out to a commercial vendor, which will complete and install specialty replacement parts. But it’s unclear how long that will take.

Madison Equities, which owns and manages the First National Bank building complex, plans to convert the east tower into residences. The Art Deco-style west building — which at more than 400 feet is the third tallest building downtown — will remain commercial.