# 4.27 "The Nightmare":
Morgan Hess (in the scene with Sammy Jo) apparently lives in Claudia's former apartment now. The establishing shot is from the building at
1438 Peerless Place, Los Angeles (which we first saw in # 2.16). One of the old establishing shots is reused, so the zoom on the same window like back then suggests she lives in the same apartment in that building, indeed.
The whole area has been rebuilt since filming. That place is now within a gated community.
Ravissante (Alexis and Krystle's beauty salon):
Exteriors and reception were filmed at the Century Club (screen grab 1). This charming building was located at 10131 Constellation Boulevard in Century City, CA. It was demolished in 2006, and it has taken an awful long time to redevelop this block. Construction work on the site is still ongoing.
The other interior shots of the salon were made at Georgette Klinger Salon (screen capture 2), which used to be located at 312 North Rodeo Drive, Beverly Hills, CA. I don't know exactly when that salon went out of business, but the structure was rebuilt and has been housing Dolce & Gabbana for many years.
The nightly outdoor scenes in the rain on the driveway of the Carrington Mansion and the garage complex were filmed on the grounds of what used to be the McMahon Residence at 2 Oakmont Drive, Brentwood, CA. All structures on this property were demolished approximately in 2017, and a new mansion is supposed to be built on that lot now.
Not sure where they filmed the car chase (Jeff following Fallon), but I assume it was near the McMahon Residence in Brentwood.
The exterior shot of the Denver Detention Center might be stock footage from the real facility, but I'm not sure. I think the jails in Denver have been remodeled since, and I'm not familiar with them.
The interiors of the Denver Detention Center, however, are clearly the famous Alcatraz Cell Block (a replica) on the stage at GMT Studios, 5751 Buckingham Parkway, Culver City, CA 90230.