The Montalto family owned the whereabouts of its site in the 20th century, and built the Castello Dei Baroni, incorporating the old structure.

The main layout of the interior feature the intact 18th-century building, a spacious hall, a library, a typical Grand Master bedroom, and a chapel.

[3] The address is now Castello Dei Baroni, Triq Madonna Tal-Abbandunati (Our Lady of the Abandoned Street), Wardija,[4] SPB 07.

[3] The Castello Dei Baroni is believed to be a structure built over what may have been a peasants' lodge dating back to the rule of the Order of St. John.

In around 1783, during the magistracy of Grand Master Emmanuel de Rohan-Polduc, peasants built a roofed structure in the land owned by a Maltese noble family.

[11] In the 20th century, the site of the present Castello Dei Baroni was an uncultivated agricultural field incorporating the 18th-century building and rubble walls.

[14][10] The encounter is said to have led to an arranged marriage; Busietta had always estranged his wife whom he married on 10 October 1958, and who bore him three children: Hadrian Jr., Rowena and Fiona.

[14][10] His marriage to Eileen was a turning point from a simple clerk to a prosperous life and opened before him a number of career opportunities such as a banker, businessman,[14][12][10] and the president of the Malta Chamber of Commerce.

[12] Around January 1965,[18] Busietta and Caruana, the later ‘Duke’ and a ‘Dame’ of the Ecumenical Order, bought the Castello Dei Baroni but it was claimed in a court sitting under oath that it was not intended and never used as a residence.

The couple restored the 18th-century building, enlarged the property at different points, decorated it with typical 17th- and 18th-century fittings, and adapted with necessarily requirements.

Since 1997, the Prince and Grand Master of the Order was Joseph Frendo Cumbo, who adds to his name the title Torre Sarocca, and resided in Canada.

[10][24] After the sudden death of Cumbo in 2006[26] and the disassociation of Nicholas Papanicolaou in 2011,[27] Busietta was elected as the 78th Grandmaster of the Ecumenical Order and was eventually replaced on 2 May 2015 by Sandor Habsburg-Lothringen due to his declining health.

[21][32] The building has been available for wedding receptions since the late 20th century,[3] when it was for the first time open to the public for special occasions, and remains a host for various private events.

[33][34] By the 21st century, the 18th-century structure was converted into a small hunting related museum,[3] an audio visual takes visitors around the building telling the history of the Ecumenical Order,[35] and the ground floor is used occasionally for exhibitions[36] and charity occasions.

[42] A wedding reception which took place on 20 September 2018, had undesirable outcome when electricity was not adequate for the event and a settlement for damages ended in a 5 years court hearings, with a final verdict in favour of the clients to be partially compensated.

The bill for the service and goods of the system was not paid immediately, leading to a court case in 2012 when it was revealed that Busietta and Caruana were in a bad economic state.

Under Maltese law, it carries the registration number 49292 and gives the conditional rights to use titles with:[7] The headquarters of the organization was officially lodged at the Castello Dei Baroni.