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Mega contribution🔥

But I would have 1 point:
Often 2% of the property value is used for maintenance - this is how the state does it, for example, when calculating the loss in value of properties. You are also at just under 2%. However, this always refers only to the value of the building excluding the land. So I think the maintenance reserves should be set a little lower.
In addition, most buyers of new properties would set aside less for maintenance in the first 10 years, as little needs to be done. So maybe 1.5% maintenance in the first 10 years and then 2.5% in the following 10 years🤔
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@TresComas Thank you for reading carefully 🙂. In fact, I already include the estimated production costs of the building excl. land in the calculation. More on this in part 1.

Yes, it is very likely that a buyer will set aside less for maintenance at the beginning. However, this is probably a milquetoast calculation, as even more will have to be put aside later on. The reserves can be invested in an ETF, for example, and thus generate returns.
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@TresComas By the way, the younger buildings (example from the 2nd part + Berlin) are calculated with 1.5% until the 50th or 60th year. Only the building that is already over 70 years old is calculated at 2.5%. Of course, the maintenance reserves are adjusted to inflation over time, as tradesmen's costs and materials naturally also become more expensive. Your proposal (1.5% for the first 10 years and then 2.5%) would therefore further benefit the tenant in the examples.
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@DonkeyInvestor would like to see the Excel😂
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@TresComas I can offer you the source code of a quick & dirty (but well tested) program. I started with Excel, but at some point it became too complex and imprecise. So I programmed myself a small tool.
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@TresComas In the (audio) book Kaufen oder Mieten by Gerd Kommer there is an Excel file in the supplementary material for a comparison. It's not as good as my program, but it's definitely useful 😁. If you have an audible subscription or something, you can get it. It may also be enough to do some good googling 😉
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Thanks for the Tipp👌🏻