About

“The design of each project stems from a thorough conceptual investigation. Simple geometric volumes, clean lines, top quality materials and small details work together to create a unified space that carries a powerful yet humble sensation; a sensation that defines each project and has come to be the signature of the firm.”

Block722architects+ is an Athens and Stockholm based architecture practice. It was founded in 2009 by Sotiris Tsergas, Katja Margaritoglou and Konstantinos Korfiatis.

Block722 works in the architectural field, fully encompassing the interior design and construction fields through Block722architects+, managing a wide variety of projects from the planning state throughout completion. The practice’s expertise in the complete project management of residential, retail and business projects is showcased in the portfolio. The office’s individual and collective experience ensures the collaboration with competent and specialized suppliers and craftsmen, guaranteeing the meticulous and accurate realization of the architectural concept. A close relationship with the client is of the utmost importance to the practice, in order to ensure a prosperous collaboration and the best possible final result.

Block722 was founded in the heart of Athens, on Patission 57, one of the most densely populated areas of the capital. The intense cultural and ethnic diversity of the area have enhanced the practice’s relation to the city’s reality and constant adaptation to new and interesting design elements. The office’s location, urban block 722, becomes more than a city planning number – it evolves into an element of identity.


Sotiris Tsergas
Co-Founder, Architect Engineer NTUA

Katja Margaritoglou
Co-Founder, Interior Designer

Kostas Korfiatis
Co-Founder, Civil Engineer

Vasiliki Moustafatzi
Architect Engineer NTUA

Francesca Balfoussia
Architect Engineer NTUA

Nikos Korfiatis
Civil Engineer

Sotiris Tsergas

Sotiris is a registered architect in Greece, and has been practicing architecture for more than 15 years. His body of work includes a big variety of high end private projects, residences, hotels, offices and retail stores. He graduated from the National Technical University of Athens in 2000. In 2003 he became project manager of the Olympic hockey stadium. In 2005 he created his own architecture office. In 2009 he co-founded BlocK722 architects+ along with Katja and Konstantinos.

Katja Margaritoglou

Katja graduated in 2003 from the Vakalo College of Art and Design in Athens. In 2004, she started her own studio, taking on large and small scale projects, overseeing every aspect and step of the design – from rebuilding the inner shell of a structure, to decorating with self-designed fabrics and custom made objects and furniture. In 2009 she co-founded BlocK722architects(+), along with Sotiris and Konstantinos.

Kostas Korfiatis

Konstantinos is a registered civil engineer in Greece, having graduated from NTUA (1994) and obtained an MSc in hotel management from the University of Surrey in 1997. In 1998 he began working as an engineer in private projects. Since then, his portfolio showcases construction experience in private residences, hotels, offices and retail stores. In 2009 he co-founded BlocK722architects+ along with Sotiris and Katja.

Vasiliki Moustafatzi

Vasiliki is a registered architect in Greece and joined Block722architects+  in 2014. Her diploma thesis won the Environmental Awareness Award “Ecopolis 2014”. After graduating from NTUA School of Architecture in 2013, she attended interior design, visual merchandising, energy inspection seminars, and also participated in various architectural competitions.

Francesca Balfoussia

Francesca graduated from NTUA in 2013 and since then is a registered architect in Greece. Her work portfolio focuses on interior and industrial design projects. She has participated in various design exhibitions and architecture competitions. She has attended short courses in lighting and industrial design. In 2015, she joined Block722architects(+) team.

Nikos Korfiatis

Nikos is a structural engineer, having graduated from the School of Technological Applications, department of Civil Engineering in 2008. In 2005, he started working as a trainee in private construction companies, taking on renovation and refurbishment projects. Since 2009, he has been cooperating with Block722 in the construction field.