My unanimously disappointing results for WeChat encounters (some mentioned here on UKP) have mainly been at Chelsea Cloisters. Go back a decade and it used to be the place to fins all kinds of Slavic gems who could raise the dead with a wink and keep you cumming just thinking about their gorgeous bodies, good attitude, fun services and the occasional special treats.
Can't imagine the reception staff after all this time are particularly fussy about who walks through provided they are tooled for bother to have already disrobed. Just walk to the lift or stairs with confidence and you won't be challenged. All the lift lobbies are CCTV covered so best not loiter there on any floor but you can always dodge the spying eyes by pausing on the stairs. If you want a more discrete exit then go down the back stairs and you can leave by the street behind.