This story has been updated with comments from Mike Bergren, a consultant for the Downtown Development Authority.

The southeast corner of Liberty and Main streets in downtown Ann Arbor remains closed to sidewalk traffic as crews work to install handicap-accessible curb ramps.

Robert Saladino of the Ann Arbor-based Saladino Construction Co. said work on the corner began on Tuesday and should be finished within a few days.

He said the other three corners at the intersection already have had the same work done to become handicap-accessible.

Mike Bergren, a consultant for the Downtown Development Authority who is overseeing the curb ramp replacement work downtown, said the work is being done by the DDA as part of a consent decree.

The city remains under a consent decree stemming from a lawsuit brought by Ann Arbor Center for Independent Living to bring all corner curb ramps into compliance with the Americans with Disabilities Act on streets that were resurfaced or reconstructed between 1992 and 2004. The work must be done by the year 2018.

The center claimed in its August 2004 lawsuit that the city had failed to build curb ramps according to federal and state accessibility guidelines and standards. The suit alleged the city's failure resulted in unsafe sidewalks and intersections for people using wheelchairs.

After the curb ramps on Main and Liberty are done this week, Bergren said, the same type of work will be done next week at Liberty and State. The work at both intersections is costing about $55,000.

These will be the very last of dozens of curb ramps the DDA has paid to replace downtown over the years as part of the consent decree, Bergren said. The work typically involves regrading the slopes and leveling the landings, making them safer for people in wheelchairs.

Because of old vaults that are under the sidewalks near Main and Liberty, Bergren said, it's more of a challenge to do the work at those corners, so that's why they're among the last on the list.

The city has a separate $576,000 contract with Saladino Construction for miscellaneous concrete work that includes curbs, gutters, sidewalks, corner ramps and driveway approaches.

Ryan J. Stanton covers government and politics for AnnArbor.com. Reach him at ryanstanton@annarbor.com or 734-623-2529. You also can follow him on Twitter or subscribe to AnnArbor.com's email newsletters.