The 21 most in-demand office buildings in and around downtown Detroit are more than 92 percent leased.

That's according to the annual Detroit Skyline report from the Royal Oak office of Chicago-based brokerage firm JLL, which has been compiling this data for a few years.

At 7.7 percent vacant, those buildings have filled up a little bit since last year, when their combined square footage of nearly 10.8 million square feet of the city's primo office space was 8.8 percent empty. The vacancy rate was 7.5 percent in 2017.

Rents have also continued to be driven upward, now at $24.99 per square foot, up a whopping $1.52 per foot from last year, when they were $23.47. Even that was nearly a $1 jump from 2017, when they were $22.55 per square foot.

In all, rent in those buildings has increased 10.82 percent in the last two years, which has pushed some nonprofits and smaller operations out of the downtown core to the north in areas like New Center.

"Downtown Detroit's skyline remains very tight in 2019," said Harrison West, a research analyst for JLL. "With an evident shortage of quality direct available space in the skyline, everyone is keeping an eye on the Hudson's and Monroe Blocks projects to see how much office space will ultimately be included and when it will deliver. As of now, the only true large blocks of available space are in the Renaissance Center, where more than 60 percent of the skyline vacant is situated."

West said part of the rent increase was due to rents in the RenCen rising from $23.50 per square foot to $25.50.

"Everything is pretty full," West said. "The large blocks available are in the RenCen. If those spaces aren't taken up in the next year, this probably isn't going to change a lot" by the time the next Skyline report is released.

Here are the deets on those 21 buildings:

• 211 West Fort St., 446,000 square feet. Occupancy: 77.2 percent

• 150 West Jefferson Ave., 500,000 square feet. Occupancy: 100 percent

• One Woodward Ave., 360,000 square feet. Occupancy: 100 percent

• Ally Detroit Center, 1 million square feet. Occupancy: 96.6 percent

• The Guardian building: 643,000 square feet. Occupancy: 97.9 percent

• Chase Tower, 505,000 square feet. Occupancy: 100 percent

• First National Building, 850,000 square feet. Occupancy: 96 percent

• Chrysler House, 416,000 square feet. Occupancy: 97.3 percent

• One Kennedy Square, 247,000 square feet. Occupancy: 100 percent

• 1001 Woodward Ave., 305,000 square feet. Occupancy: 99 percent

• One Campus Martius, 1.08 million square feet. Occupancy: 100 percent (Note: This does not include the under-construction addition of 310,000 square feet)

• Renaissance Center, Tower 100, 588,000 square feet. Occupancy: 85 percent

• Renaissance Center, Tower 200, 593,000 square feet. Occupancy: 48.4 percent

• Renaissance Center, Tower 300, 585,000 square feet. Occupancy: 100 percent

• Renaissance Center, Tower 400, 576,000 square feet. Occupancy: 92.7 percent

• Renaissance Center, Tower 500, 307,000 square feet. Occupancy: 100 percent

• Renaissance Center, Tower 600, 307,000 square feet. Occupancy: 69.9 percent

• Ford Field office space, 331,000 square feet. Occupancy: 100 percent

• 1900 Saint Antoine, 99,000 square feet. Occupancy: 100 percent

• Brewery Park, 371,000 square feet. Occupancy: 80.8 percent

• The Fisher Building, 635,000 square feet. Occupancy: 92 percent