"Landesindex" and "Hypotekarzins" - how do they influence the rent?

Hi folks

I’m in the process of changing the apartment and notice confusing thing in my contract:

Even though that both factors in this table are currently lower than before, the rent is actually higher than before.

Is it a mistake or do I not understand this “Landesindex” and “Teuerungsausgleich” concept properly?

The index values listed are based on different start dates.
Taking Dec 2000 = 100 as base gives 114.1 for april 2023
Taking Dec 2020 = 100 gives 107.4 currently, and 106.3 for april 2023, so 1.1% increase of which 40% can be used for a rent increase.

Combined with the reference rate decrease that should give a small decrease (-2.91% +0.44%).

But the owner can always claim a general increase in costs, plus adjustments to the general rent levels which is likely to have gone up in the last two years.

Thanks Roxi! So this index gets a “reset” sometimes. Then it’s really hard to compare, ain’t it?

My case is:
I want to make a move within the same building, just changing 3.5 flat to 4.5 flat.
For 3.5 flat (86 m2) I pay now 1988 fr (Hypothekarzins 1.75%)
For the new one, 4.5 flat (only additional 14 m2) the administration wants 2320 fr (Hypothekarzins 1.5%).

Now, considering that this is the same building (also the same floor, the same layout, just one room more) and the only advantage is these additional 14 m2 - I’d say that 332 fr for this is pretty steep. The appliances like dishwasher or tumbler are actually older in this new flat. Please note also that the Hypothekarzins is also lower, so in my favor.

I don’t understand the height of this cost difference and as a tenat want to question it when I start renting (one has 30 days from the start - called “Anfechtung”).

Do you think I have a chance in questioning this? If yes, what would be the best approach?

You want to increase the area by 16%. Based on that alone I fail to see your problem.

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you’re going from a 3.5 to 4.5 and only paying 332 (17%) extra?