This building stands in a wide area between Viale Regina Elena, Piazza Marghinotti and via Sulis.

The construction of the building took place in two different periods. The engineer Niccolò Mura conceived the project for the first block erected between 1901 and 1915, facing the side of the Bastion of Saint Remy. The engineer Riccardo Simonetti is the author of the project concerning the extension of the façade that extends to Piazza Marghinotti, which took place in 1926.

After the bombings of 1943 the palace suffered extensive damage and was the subject of an accurate restoration work after the war. The two blocks are entirely different from each other even if the extension works did not result in substantial changes in the architectural style. Also the materials used for the two sides are different: granite, limestone in the base and clay for ornaments in the part that faces Viale Regina Elena; concrete aggregate and cotto for the façade in front of Via Sulis and Piazza Marghinotti.

The building was built in 1850 and in 1927 the engineer Giacomo Crespi was responsible for the supervision of some renovation works.

The building houses the headquarters of the Historical Institute Foundation "Giuseppe Siotto", founded in 1990 with the aim to promote the study and diffusion of Sardinian history. The foundation owns an important library which includes rare books of the sixteenth century. In the Room of Portraits and in the Green Room it is possible to admire valuable paintings by artists such Marghinotti, Figari, Morgari. The photographic antique collection concerning the family and the staff of Siotto company is of remarkable documentary and historical importance.

The palace, built in 1858 and designed by the architect Gatano Cima, rises in Via Genovesi in Castello district.

The architect Cima, whose design was commissioned by the Count Cao of San Marco, had the opportunity, as he had done for other palaces in Cagliari, to transfer the peculiar elements of his work in the building's facade. The palace, in Neoclassical style, is structured into a ground floor and two upper floors. The windows of the first floor have protruding balconies with wrought iron railings; the windows of the second floor, lined with festoons, have flush balconies on the facade. In the spotlight, the emblem of the Cao family carved on the central balcony of the first floor, which depicts two dolphins and a seagull in the act of swimming (it is important to underline that the dialectal term "cau" refers to the Seagull).

It was built by the Sanjust Family of Teulada and bought some years ago by the Great Orient of Italy to host the headquarters of the Masonic Lodge.

The original building housed the headquarters of the University commissioned by Philip IV and later, from the eighteenth century, was used as a military barracks. It was abandoned in 1852 and later bought in order to be replaced by a new building. The building's architectural style is heavily influenced by the classic taste clearly visible in the openings surmounted by ashlars’ frames and windows framed by bands in both the main facade on Via Indipendenza and via Lamarmora.

It is located in Piazza Palazzo, in Castello district. The building dates back to the fourteenth century and it became the seat of the Viceroy since 1337, on orders of Peter IV of Aragon.

Over the centuries, the palace went through several changes, such as the eighteenth-century restorations, including that made by the Piedmontese engineers de Guibert and de Vincenti, who built the main staircase leading to the first floor (“piano nobile”). In 1735, Della Vallea was the author of the restoration works of the first floor (“piano nobile”). The façade overlooking west, with the main gate perfectly aligned to the staircase, was restored in 1769, the same date written in the inscription on the French window's lunette, that opens onto the central balcony.

The royal family, exiled from Turin, which was occupied by Napoleon, settled there from 1799 to 1815. In 1885, the building became the representative seat of the Province, which immediately began the renovation works. The decorative works of the Council Room were committed respectively to Domenico Bruschi from Perugia for the frescoes, and to Angeletti for the stuccoes.

The building rises at the corner between Via Lamarmora and Piazza Carlo Alberto. The main facade overlooks piazza Carlo Alberto and it is articulated on three floors and a mezzanine.

The nobleman Francesco Barrago was the original owner, but the marriage between two members of Barrago and Prunas families led them to become the owners of the building. The building has the typical elements of the Neoclassic style: windows dominated by blind gable, levelled cornices and the large balcony that passes through the entire first floor. Next to the middle floor, on the corner with Via Lamarmora, it is located a small box containing the Madonna of Lourdes in miniature with the following epigraph: "To the Holy Virgin of Lourdes, on the centenary of her appearances, Marianna and Oliviero Prunas, for eternal gratitude– MCMLVIII".

The bulding is situated at Via Lamarmora and takes the name from the lawyer Emanuele Ortu Ravot who owned it in 1870.

The appearance of this building is similar to the other Neoclassical buildings in Castello district. The façade doesn't show special decorations and has windows with wrought iron railing balconies. A ceramic plate with the old street number of the building, located next to the entrance's arch portal, brings back to memory of the most important cultural society of the time (second half of XIX), the Philharmonic Club, which had its headquarters in the palace.

The building has four facades overlooking piazza Independenza, Via Martini, vico Martini and via Canelles.

Among the historic districts, Castello has fewer Art Nouveau works than the others, but some ancient buildings are an exception because during the twentieth century they were renovated and decorated with floral motifs, especially in the balconies.

The Onnis-Bellegrandi (former Chapelle) Palace boasts a valuable decorative apparatus. The fronts overlooking Via Canelles and Via Martini spread over two floors, characterized by windows and balconies with wrought iron railings.

On the internal façade overlooking Via Martini, a splendid female bust, built in Liberty style, catches visitors' attention.

On the façade overlooking Piazza Indipendenza, there is a seventeenth-century plaque commemorating the construction of a fountain, at the expense of the municipality. The water for the fountain came from the well of Santa Lucia, about 90 meters deep. On the same wall there is also an iscription dating back to the fascist period: it is a part of the speech given by Mussolini on 9 May 1936, when Il Duce proclaimed the Italian empire. The inscription (partially visible today) says: "The Italian people created the Empire with their blood, will fertilize it with their work, defend it against anyone with their weapons. Mussolini".

The bulding has two facades: the main front situated in Viale Trento and a secondary in Viale Luigi Merello

The main front is on three floors that end with a cornice, on top of which are located four statues. Particularly interesting is the use of terracotta in the balconies with perforated railings, in the pillars, in the frames of the openings, in the statues that hold the balcony above the main entrance.

Ebau Palace, built in 1945, was planned by the architect Salvatore Rattu. It is a work whose facade is marked by vertical bands that make it different from the horizontal bands of Zedda Zedda Palace.

The Ebau Palace represents a typical example of fascist architecture, in littorian style with hints of the Bauhaus school. It is part of the artistic current of rationalism, in Cagliari linked to the names of Ubaldo Badas and Salvatore Rattu, as in this case. Parallel to the ideology of the regime, rationalism is permeated by the need for rigor and urgency of the order.

Palazzo Ebau observes the dynamics of the rounded acute corner and its vertical magnificence stands out in contrast with the nearby buildings of Paoli street and San Benedetto square.