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Why invest in becoming a landlord?
There are at least three important aspectss missing from your equation. However they come with some uncertainty as one typically cannot tell the future performance. Appreciation of the rental units value. When comparing to the gain of any alternative investment an increasing value of the flat is a gain too. Increase of rent. Rents are typically adjusted either on a regular basis or at least when changing tennants. Calulation with a flat rent over 20 years is therefore way off. Tax deductions due to capital expenditures (i.e. mortgages), expenses for the upkeep and maintenance of the property, conserving and management, and so on. Obviously those are depending on your local legislation. There are multiple other issues to consider of course, e.g. inadvertant vacancy, which would not act in your favour.