About us

  • Owner-operated business
  • Top management team with longstanding competencies in the real estate sector
  • Clients include HNWI, family offices and institutional investors, such as insurance companies, pension funds and foreign project developers     

Carsten Ahr

The Ahr family has been active in the real estate business since 1890. Together with his twin brother, Carsten Ahr expanded the Ahr Service family business (today called: Apleona Ahr Healthcare & Services GmbH) to become one of the leading system providers of real estate services. Since the founding of Prosperis in 2006, Carsten Ahr has concentrated on the management of real estate investments, together with the supervision and management of the related portfolio.

Andreas Landertshammer

After working for a number of years an architect in San Francisco, he became Director Construction at Tishman Speyer Properties in Berlin, with responsibility for various positions in the Friedrichstadt Passagen and Sony Center projects. As the Managing Partner of Feri Real Estate GmbH (today called: FREO GmbH), he was in charge of the project development and real estate investment areas on numerous large-scale projects and transactions in Europe. Since 2003, he has been an independent Development & Investment Consultant advising and supporting family offices, foundations and institutional investors. One focus here has been on residential, office, retail and hotel transactions, as well as on project developments.

Our Competencies

Taking each of our client’s investment profiles and requirements as our basis, we strive to find the ideal investment property for them at a reasonable market value. Thanks to our close contacts with developers, architects and real estate owners, we are able to act quickly when favourable opportunities arise.

Value Added  
Hotel Real Estate  
Real Estate Management  

More about our services

Our References

„Goethe 34“ in Frankfurt
Superior retail and office development in top-name Goethestraße shopping street

Project Development Information:

Project: Refurbishment of the existing building from the 1960s in the heart of Frankfurt’s city centre
Location: Directly facing the Opernplatz (Opera Square) landmark, on the corner of world-famous luxury Goethestrasse shopping street
Investor: German family office
Rental space: 10,000 square metres
Volume: €50 million
Anchor tenant: MCM
Feature: Landmark architectural design
Prosperis role: Andreas Landertshammer was responsible for the transaction management and project steering


"City Lofts" in Hamm
Abandoned print works converted into student dormitory

Project Development Information:

Project: Revitalisation of abandoned building near market place in Hamm city centre
Investor: German non-profit foundation
Rental space: 5,000 square metres
Volume: €8 million
Pre-let: More than 90%
Anchor tenant: University of Paderborn
Feature: Procurement of old unused factory at very low price and conversion into 100 student apartments and 10 normal apartments
Prosperis role: All-round service including investment management, development management, project controlling and holding management


Value-Add Investment FFM
Change management for undervalued project in top Frankfurt location

Project Development Information:

Project: 30% commercial and 70% residential tenants; bought under value
Location: Directly facing Frankfurt central train station
Investor: private entrepreneur from China
Rental area: 3,050 square metres
Volume: €10 million
Occupancy rate: 100%
Feature: €2 million added value in 3 years through refurbishment and rental increases
Prosperis role: Complete services including project sourcing, transaction structuring, technical and commercial services, as well as sales management


„Sony Center“ in Berlin
World famous XXL complex in top Berlin location

Project Development Information:

Project: Development of multi-use complex in Berlin city centre, including cinema, retail, hotel, prime office and luxury residential units
Investor: Sony Corporation
Rental area: 132,500 square metres
Volume: €750 million
Anchor tenants: Deutsche Bahn, Cine-Star
Feature: Tent structure above public forum; integration of historical hotel building; access to underground and overground train systems
Prosperis role: Andreas Landertshammer was Director Construction with Tishman Speyer in Berlin and the senior project manager


„Quartier 205“ in Berlin
Landmark property located on world-famous Gendarmenmarkt square in Berlin

Project Development Information:

Project: Development of multi-use complex in Berlin’s city centre, including retail, food court, prime office and luxury residential units
Investor: German institutional investors
Rental area: 93,000 square metres
Volume: €450 million
Feature: 4-story atrium with sculpture
Prosperis role: Andreas Landertshammer was Director Construction with Tishman Speyer in Berlin and the senior project manager


More about our references

Mittelweg 1, 60318 Frankfurt am Main | Phone: +49 69-204 3402-0 | Fax: +49 69-204 3402-23 | info@prosperis.de