Share your insights or perspective on the financial matter presented in the input.

Why invest in becoming a landlord?
with 150K € to invest to "become a landlord" you have several options: Pay for 100% of one property, and you then will make a significant percentage of the monthly rent as profit each month. That profit can be used to invest in other things, or to save to buy additional properties. At the end of the 21 years in your example, you can sell the flat for return of principal minus selling expenses, or even better make a profit because the property went up in value. Pay 20% down on 5 flats, and then make a much a smaller profit per flat each month due to the mortgage payment for each one. At the end of the 21 years sell the flats. Assuming that a significant portion of the mortgage is paid off each flat will sell for more than the mortgage balance. Thus you will have 5 nice large profits when you sell. something in between 1 and 5 flats. Each has different risks and expenses. With 5 rental properties you are more likely to use a management company, which will add to your monthly cost.