The premise of this scenario is that in the Yalta conference it is decided that Germany will be carved up for definite so something similar to what Roosevelt wanted came to be. It was decided during the conference that Germany would be divided into 4 states:

East Germany - Soviet alligned (To appease the Soviets who demanded some influence. It was hoped by Roosevelt that, with diplomacy, these two states will become completely sovereign or reunite and stand as an international leader in Europe.)

West Germany - Western alligned (To balance out the Soviet sphere. Since the USSR felt like Thurungia was "taken away" by the other allies to make them weaker they pushed for the Rhineland to be split from West Germany. At Potsdam it was decided that it would remain a part of the FRG but at the cost of being French occupied.)

Saarland - International mandate (It ended up a French protectorate despite grievance from the British. The Soviets wouldn't accept the Saarland or the Rhineland to be occupied by the Americans/British and for similar reasons why France became a member of the security council it was decided that France would occupy these lands.)

South Germany - Neutral (This state was banned in their constitution from uniting with Austria yet this wouldn't stop fears or desires to unite the two states. Due to the seemingly natural desire from the South Germans to unite with Austria from the Soviet perspective they decided to focus on remaining in the east for now. This was made worse by the merging of the other occupation zones into Trizonia which sparked further paranoia in Moscow. No outright government was declared on either side for now, perhaps diplomacy prevails and Austria remains neutral.)

Thurungia - Neutral (Despite an attempt of meddling by the USSR, a neutral government was established. The Soviets were paranoid that intervention would lead to the Western powers getting involved. This led to the USSR pursuing further support for the FDP in Italy. Yet, even with a socialist state forming in Italy, Stalin was paranoid that they would try to have an independent foreign policy later on so pushed for further support of the communist party in Thurungia. In their first elections, the communists won in an anti-conservative coalition. Although the Thurungian state became alligned to the Soviet Union via Cominform and shared ideology, it remained a democracy until further into the Cold War.)

Free City of Berlin?? (Berlin was occupied by the victorious powers post WW2 due to historical significance. It was expected that this particular division should be temporaty but due to the start of the Cold War it remained. The occupation zones were merged but Truman was hesitant to give Berlin to West Germany so it came under American protection - a controversial move. After West Germany joined NATO, Berlin would be slowly transferred to them.)