To be clear, visitors are hosted by US in the 2nd bedroom, usually around a week.
Reading the Immigration act, section 4, defines clearly who CAN or MUST do a TM-30
What if the tenant decides to accommodate a foreigner friend for a few nights ?"
""""He is not living in the condo""""
...BUT... he controls who is IN the condo.
Immigration act section 38 would seem to apply,
especially the wording about reporting a NEW address within 24 hours.
AGAIN, enforcement depends how strict is the local IO policy
With the nationwide crackdown by Immigration, I try to follow, as I read them, all regulations , police orders and local policies