Spock was much later getting back than he had intended. Meeting with the elders had taken longer than anticipated and then one of them had suggested a meal and before Spock gave it very much thought, he was agreeing.
Vulcans could be quite the talkers when they had like-minded sorts around them and the dinner had taken hours at a vegetarian restaurant much farther away than Spock had realized.
By the time the hover taxi pulled up in front of the condo building, the rain was coming down hard and twilight had come and gone. Spock was very anxious.