History
Siaga Mansion of a homonymous engineer Siaga Mansion lies at the intersection of the streets of Vas. Olgas (Queen Olga) and P. Syndika. It was built in 1890, designed by exceptional architect Xenophon Paionidis and intended to be passed onto the family of banker Chatzilazarou.
The Euphrosyne, the wife of Pericles Chatzilazarou, the Honorary Consul of the United States, bought the land from doctor Gr. Gravaro where he builds mansion. The press of the time referred to it as the American Consulate. 
The Athenian architect Xenophon Peonidis chose to construct a neoclassical style building which was his favourite architectural style that followed most of his buildings. In 1912, the Palace hosted the Royal family, but later the building was purchased by the Siaga family, in whose possession it remains today. Despite the passage of time, the building retains original exterior and interior decoration. In 1985 it was declared a protected monument.

Layout
The land where the listed house is erected, 131 Queen Olga and Peter Syndika is 923,11 square metres.
It has two floors, mezzanine, basement and an attic.
The ground floor is 264 square metres and has two rooms that can be used as bedrooms, 2wc, kitchen and reception area across 200 metres.
The Mezzanine is 57.71 square metres that is part of the ground floor and has one bedroom and a dressing room.
The floor is 259,11 square metres and has reception, kitchen, 2wc and four bedrooms.
The basement is 218,311 square metres and is habitable with has kitchen, wc, three rooms, reception area.