Our Team

Your contact persons at M.A.R.T.E.L.L. Grundstücksgesellschaft mbH

martell-grundstuecksverwaltung-immobilien-berlin-team-leif-raszatLeif Raszat - Executive partner

The born saxon was operating as graduate economist and graduate banking administrator in managing positions in credit unions and saving banks. In the past years Mr. Raszat successfully led a medium-sized Sparkasse as CEO. In the year 2017 he took over the M.A.R.T.E.L.L. Grundstücksgesellschaft from the past executive Partner Mr. Martini. Together with the M.A.R.T.E.L.L. team Mr. Raszat is set to continue accompanying our customers intensively in their real estate business. Mr. Raszat enjoys spending his spare time with his family. He stays fit with walking and swimming regularly.


martell-grundstuecksverwaltung-immobilien-berlin-team-speiserKatrin Speiser - Management assistant

Born in Dresden, Ms. Speiser came to Berlin as a child and after her studies achieved a diploma degree as a construction engineer. Since the foundation of the M.A.R.T.E.L.L. Grundstücksgesellschaft mbH she not only supports the management in all organizational and coordinative tasks, but also organizes the procedures in the office reposefully and competently. For the love of nature Ms. Speiser spends her spare time together with her family to go on hiking or bicycle trips.


martell-grundstuecksverwaltung-immobilien-berlin-teamThomas Siggelkow – Sales and Investment

Born in Northern Germany and after succeeding his master training, Mister Siggelkow worked in the facility-management for a couple of years before moving to the building industry of Mecklenburg. In and around Schwerin he successfully developed various construction areas for single- and two-family houses. After moving to Berlin he studied business administration with focus on real estate. He subsequently worked for marked-leading broker companies in Berlin before he joined the Team of the M.A.R.T.E.L.L. in 2017 to bring in his extensive experience and his acquired competences. Mister Siggelkow finds balance to his professional activity with his grandchildren, on bicycle trips, swimming and occasional golfing. He is also a member of the action group “Hauptstadt Berlin e. V.”.


martell-grundstuecksverwaltung-immobilien-berlin-teamJames Bongards - Acquisition and Evaluation

Born in Fredericia/ Denmark and raised in Potsdam, Mr. Bongards moved to Berlin in February 2014 to start his apprenticeship. There he graduated as a real estate manager very successfully and ambitioned at the M.A.R.T.E.L.L. Grundstücksgesellschaft mbH. He now brings his profound knowledge to bear by acquiring and evaluating properties. With football, volleyball and baseball Mr. Bongards stays in form.


martell-grundstuecksverwaltung-immobilien-berlin-teamAndreas Stenschke - Acquisition and purchasing

The native Westberliner graduated from his apprenticeship as bank business management assistant in Berlin and subsequently studied business economics and law at the “Freie Universität in Berlin”. After his studies and state examination he worked continuously, sometimes as employee but sometimes also as freelancer in the real estate branch. With his profound knowledge, experience and contacts Mister Stenschke takes over the acquisition and purchasing part in our company. In his spare time he plays senior team tennis and in the winter he likes skiing with his two children in South-Tirol.


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