A long family tradition – Our History



Wilma Sierra Blanca is the result of a joint venture between two prestigious privately owned companies, Wilma Development Spain and SB Developments Partners, who have joined forces to bring the best full-service in high end luxury developments.  

Wilma Development Spain is represented by its directors, Frank Maas and Olaf Claessens. Pedro A. Rodriguez is the head of SB Developments Partners. 

Wilma Sierra Blanca combines the international experience, track record and financial strength of Wilma with the local building and market expertise of SB Developments Partners.


Founded in 1939, this family company passed down for three generations and holds the 2nd position in the German Project Developer Ranking List of Bulwiengesa 2015. 

The company masters the project development of residential real estate from the first to the last milestone: from land acquisition, planning and coordination of construction to turnkey real estate. 

With more than 1,000,000 houses and apartments built and sold, a current development portfolio of €2 billion, € 350 million of annual turnover, 5 offices in Germany, and 150 employees in the Netherlands, Germany and Spain, Wilma is one of the leading developers of residential property in terms of size and quality.

SB Developments Partners

It is a Spanish company that manages all phases of the development and construction process. Services encompass project conceptualization, master planning, design, project management, cost control and quality turnkey construction.  SB Developments Partners is highly positioned in the real estate and construction sector in the Marbella area and all the neighboring municipalities. 

Sismo Building Technology Spain offers an innovative building solution. As a steadily growing quality construction alternative, Sismo has expanded the group´s reach beyond the local region to the national market in the supply of its building system. 



Axis, Frankfurt – Germany

High rise of ca 30.000m2

Currently won the FIABCI world silver award for best residential high rise, as well as gold awards for high rise building and most innovative development in Germany.

Freiraum, Düsseldorf - Germany

City development of ca 60.000m2 for institutional investors and end users. More information soon.

The Muse & Casanova, Rotterdam (Netherlands)

Waterfront development of two neighboring towers with ca 40.000m2.

This new iconic complex, strategically located on the first line of the new Rotterdam Wijnhaven residential area, on the historic dock of the metropolis.