I have always been able to use the good name of the Church and get the landlord to accept the check from the unit. My backup would have been to have a leader obtain the cashier's check, then reimburse the leader from the FO funds, keeping a clear record of why it was done that way and making sure the name of the FO recipient was on the purpose line of the check used to reimburse the leader.
But the first way almost always works, since it is a Church leader, and never the member, who is having the conversation with the landlord.