| TÜV NORD Certificate | 
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| Reference Arbeitsgemeinschaft Rohbauarbeiten Neubau LBV Düsseldorf german |
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| Recommendation of company Stalbet polish |
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| Recommendation of company Zublin german |
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| Reference of company Metropolis polish |
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| Recommendation of company HT Wohnbau GmbH german |
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| Recommendation a private investor polish |
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| Reference of company Gołuszka polish |
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| Reference of company Mardimex polish |
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| Recommendation of company Köster german |
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| Reference Arbeitsgemeinschaft GKM Block 9 german |
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