Alice's Property
For simplicity, assume Alice had the children Bob, Charly and Dorothy, she owned the house fully at the time of death, and there are no lingering debts or contracts.
Now, the three own the house and anything Alice once owned jointly as inheritor community (Erbengemeinschaft) to equal parts. The same goes for the company once owned by Alice.
If the three can't deal with it together, there is the option to buy-out the other inheritors or to split it in parts they deem equal. If they can't determine the worth of the parts together, the inheritance court can have that done and mandate that they make earnest offers to buy the others out. As the last option, if nobody can bring up the money, the court can mandate a sale and split the proceeds by all inheritors.
Alice's renters
Now, Alice did rent out some part of the house. The renters are obligated to pay the rent.
Until the account of Alice is closed, that account is part of the inheritance and one proper target for rent payments till the ownership is solved. A change of the payment target for rent is only valid under German law, if the inheritor can prove that he is entitled to the rent payment, for example by proving that he inherited the property with a paper from the inheritance court. That paper would also list who else is part of the inheritance group, and then it would require a signed slip from all inheritors that they agree that the new account is proper.
Now, it gets tricky if Alice's account is closed and still rent is due. In that case, the renter is still obligated to pay, but he can fulfill this duty by having the rent deposited at the court under § 372 BGB. Technically that money enters an escrow account bound to the inheritance. The only further obligation of the renter is to point the possible landlords to get the inheritance in order to recieve their rent from the court. The escrow account is handled as part of the inheritance and payed out to the proper recipient once that is established.
As an interesting point: until the inheritance is solved, any attempt of an inheritor to unilaterally end the lease is void unless the inheritance court agrees to it. The court also can stand in to receive a breaking of the lease if it is unclear if or who is the proper inheritor.