Blair Underwood was On Netflix's Strong Black Lead podcast, and he talks about being approached by the producers of SATC. He was offered a role as a Black record exec whose sister who didn't want him dating white women. He says, "I said no first...there was an episode where...Kim Cattrell's character [Samantha] wanted to be with a Black man and it was all about curiosity," he said. And I said, 'Thank you, but no thank you. I appreciate it and I'm honored.' And I mean that, I don't take that lightly when people offer you a job. But I said, 'I'm not interested in being the Black curiosity, but thank you.'"
The producers came back two years later to offer him the role he would eventually take, one with a large arc and substance.
"...I said, 'Is it going to be about his race or is he going to be a human being?' They said, 'Naw, he's a doctor that's in [Miranda's] building who she meets in an elevator and they hit it off.' That was important," Underwood said.
The humanizing role, plus the fact that Sex and the City was one of his wife's favorite shows, he took the job.source