A vacant apartment does not automatically offer a higher return. A rented apartment is not automatically a safer investment. The decision only becomes sound once the specific apartment has been properly assessed within its specific neighborhood.
This assessment is particularly important in Berlin in 2026. The average asking rent is 15.80 euros per square meter. In contrast, the 2026 Berlin rent index shows a median value of 7.71 euros per square meter. The gap between the asking rent, the comparative rent, and the existing rent is precisely the area that investors need to understand before making a purchase.
Buying an Unoccupied Apartment: Flexibility with Legal Limits
An unoccupied apartment offers the greatest freedom to customize. Buyers can modernize the apartment, rent it out again, or use it themselves in the future. In a tight market like Berlin, this can be attractive—especially for compact apartments in well-connected micro-locations.
The key question, however, is: What rent is not only feasible in the market but also legally sound?
In Berlin, the rent cap remains in effect until the end of 2029. For new leases, the rent may generally not exceed the local comparative rent by more than ten percent, unless an exception applies. For investors, this means that the asking rent in the surrounding area is an important market indicator but not an automatic basis for calculation.
A vacant apartment is more likely to fit an investment strategy if:
- the legally achievable rent has been thoroughly verified
- the micro-location shows clear demand
- the floor plan suits the target demographic
- modernization costs remain manageable
- the vacancy period has been factored into the financial plan
- the possibility of future owner-occupancy may be a factor
- The purchase price, maintenance fees, and financing align with the net rent
Vacant 1- to 2-room apartments in locations with good public transportation connections, proximity to universities, hospital campuses, office districts, or urban commercial centers are particularly relevant. In these areas, demand arises not only from the district’s name but also from the target audience’s daily life.
Buying a Rental Apartment: Recurring Income with Limited Flexibility
A rented apartment generates ongoing rental income starting from the transfer of ownership. This can make financial planning more predictable. At the same time, the buyer assumes the existing lease—including the rent amount, contract structure, and legal framework.
In Berlin, this is a particularly sensitive issue. Many existing rents are significantly below current asking rents. Therefore, the return on investment is determined not by the theoretical market level, but by the actual net rent (excluding utilities) paid and its potential for legal adjustment.
Before purchasing a rented apartment, the following points should be reviewed:
- current net rent (excluding utilities)
- Start date of the lease and lease agreement structure
- recent rent increases
- Comparable rent based on the rent index
- Difference between the current rent and the legally permissible rent
- Non-apportionable portion of the building maintenance fee
- Condition of the apartment
- History of renovations
- Minutes of the owners’ meeting
- Planned improvements to the common areas
A rented apartment can be a good investment if the rent, costs, and condition are already sustainable today. The situation becomes critical when a low existing rent is combined with high maintenance fees, the need for energy-efficiency investments, or major renovations.
The most important comparison: existing rent, rent index, asking rent
For investors, the difference between three rental values is crucial:
- the apartment’s current net rent (excluding utilities)
- local comparative rent according to the rent index
- current asking rents in the immediate vicinity
For a vacant apartment, the key question is what rent is realistic and legally permissible when re-leasing. For a rented apartment, the focus is on how sustainable the current rent is and whether it will yield a viable return in the long term.
In Berlin in particular, these figures can vary significantly. An apartment in Prenzlauer Berg, Friedrichshain, Kreuzberg, Neukölln, or Charlottenburg may be in high demand on the market, but due to rental law, the existing tenant situation, and the building’s structure, it may be calculated differently than a first glance at asking rents would suggest.
Service charges affect the bottom line
Service charges are a key consideration in both scenarios. Especially for smaller apartments, a high non-recoupable portion can significantly reduce the return on investment.
Investors should not only consider the gross rent, but also the net figure after expenses:
- Net base rent
- minus non-pass-through maintenance fees
- minus management fees
- minus maintenance risk
- minus financing costs
- plus potential tax implications subject to individual review
A vacant apartment with a high re-rental rate may be less profitable than expected if modernization costs, vacancy, and building maintenance fees weigh too heavily on the bottom line. A rented apartment with a moderate rent may appear more stable if the cost structure, reserve fund, and building condition are sound.
Which option fits which investment strategy?
A vacant apartment is better suited to a strategy that places greater emphasis on flexibility, re-leasing, and the possibility of future owner-occupancy. However, it requires a particularly thorough review of the legally achievable rent and the costs incurred until the property is leased.
A rented apartment is better suited to a strategy that prioritizes ongoing income, current occupancy, and more predictable revenue. This, in turn, requires a detailed review of the lease agreement, the rent amount, and potential for growth.
The better option therefore depends on the specific priorities:
An unoccupied apartment may be a good choice if:
- the new lease can be calculated with legal certainty
- the micro-location shows high demand
- the apartment can be rented out without significant effort
- the vacancy has been factored into the financial plan
- future owner-occupancy is strategically relevant
Renting out an apartment can make sense if:
- the current rent aligns with the expected return
- the lease and utility costs are transparent
- the building maintenance fees remain financially sustainable
- no major renovations are immediately foreseeable
- ongoing income is more important than short-term flexibility
The right apartment is what matters, not just its status
Whether a property is vacant or rented out—both options can fit into an investment strategy. What matters is not just the rental status, but the combination of micro-location, tenancy law, rent, purchase price, maintenance fees, and financing.
In Berlin, this analysis is particularly important because asking rents, existing rents, and rent indices can vary significantly. A vacant apartment offers flexibility, while a rented apartment provides a steady income. It only becomes a viable investment when the numbers add up for that specific neighborhood.
