There are many building blocks in the façade of the north wing of the Electoral Palace. And almost all of them have become dilapidated due to the sandstone material and years of neglect. In many places, additions must be made, while other stones can only be replaced. As a general rule, wherever original material can be preserved, this will be done. A donation of just 50 euros will enable the restoration of one stone block.

There are four balconies on the courtyard facade of the north wing, always on the first and second floors above the portals. The railings (1) are beautiful wrought ironwork standing on balcony slabs. These in turn are supported by consoles (2) with richly designed figures. Both the railings and the stone parts of the balconies need to be renovated. Both parts together need sponsors who are willing to contribute 20,000 euros.

There are twelve windows on the ground floor that are being restored. Upon closer inspection, it is striking how elaborately they were crafted: the parapet below the sill is flanked by corbels (1). A stone window cross (2) divides the windows into four sections. The upper boundary is formed by a sandstone lintel (3), which is covered by a segmented pediment (4). A complete window on the ground floor costs €5,000.

There are 14 windows on each floor on the courtyard side of the north wing, so there are a total of 28 windows that need a sponsor. These windows are more ornate than the ground floor windows, which is why the cost of restoring a window with a sill with corbels (1), side jambs (2), lintel (3), and canopy (4) in the form of curved gables is €5,900. In addition, there is the option of becoming a sponsor for one of the portrait busts that stand in the window pediments. These depict well-known and unknown personalities. Such a sponsorship costs €2,500.

The Mainz meter measures 111 centimeters. Two of them can be saved with a donation of €1,111. Due to water damage to the undersides, the decorative elements made of metopes and triglyphs, designed according to ancient models, are now barely recognizable in some places.

Under the edge of the roof is the eaves cornice, which features Mainz wheels as a special decorative element alongside floral elements. Here, too, the restoration can be subsidized according to Mainz standards of 111 centimeters with 1,111 euros.

A characteristic feature of the castle is the strong horizontal orientation of the facades. To make the wall surfaces appear lighter and more elegant, vertical pilasters in the ancient order connect the three floors. Twelve pilasters decorated with Doric capitals on the ground floor, Ionic capitals on the first floor, and Corinthian capitals on the second floor are to be restored. Sponsorship for one pilaster costs €3,000.

A portal provides access to the ground floor of the north wing on the courtyard side. This portal stands out from the sandstone façade thanks to its dark gray marble surrounds and lighter marble columns supporting the canopies. The renovation costs for such a portal amount to €20,000. A donor for this portal was found immediately after the launch of the building block campaign with Mainzer Volksbank!