Per quanto riguarda la facciata, serve la manutenzione straordinaria.

It means as for, regarding, or when it comes to.

In this sentence, Per quanto riguarda la facciata sets the topic: as for the facade / regarding the facade.

It is a very common way to introduce a subject before giving information about it.

It is best to learn it as one fixed expression.

A literal breakdown is possible:

• per = for
• quanto = what / how much
• riguarda = concerns / regards

But in real use, learners should treat per quanto riguarda as a chunk meaning as far as ... is concerned or regarding ....

Examples:

• Per quanto riguarda il prezzo, va bene.
• Per quanto riguarda la consegna, ci sono ritardi.

Correct. Here serve comes from servire, but it means is needed or is required.

So:

• serve la manutenzione straordinaria = major/special maintenance is needed

This use of servire is very common in Italian:

• Serve aiuto. = Help is needed.
• Serve un permesso. = A permit is needed.

So do not read it as the English verb to serve in the restaurant or service sense.

Because la manutenzione straordinaria is singular.

With servire in this meaning, the verb agrees with the thing that is needed:

• Serve la manutenzione straordinaria. = singular
• Servono lavori urgenti. = plural

This can feel unusual to English speakers, because the noun comes after the verb, but grammatically it still controls the verb.

Because serve + noun is a very natural Italian pattern for expressing necessity.

Italian often says:

• Serve un tecnico.
• Serve un intervento rapido.
• Servono dei documenti.

This word order presents the needed thing almost like new information. In this sentence, la manutenzione straordinaria is what is being identified as necessary.

The sentence does not focus on a person. It focuses on the condition of the building.

So the meaning is closer to:

• The facade requires major maintenance than to
• Someone needs maintenance

Italian often leaves out the person or group involved when it is obvious from context or not important. In a building-related discussion, everyone understands that this means the facade needs that kind of work.

It is a technical expression, especially common in property, construction, and administrative contexts.

It does not mean extraordinary in the sense of amazing or exceptional.

Here straordinaria means something more like:

• major
• special
• non-routine
• beyond ordinary maintenance

It contrasts with:

• manutenzione ordinaria = routine/ordinary maintenance
• manutenzione straordinaria = more substantial repair or renovation work

So this is the kind of phrase you might see in a building report, a condo meeting, or official paperwork.

Because Italian uses definite articles more often than English.

• la facciata refers to the specific facade being discussed
• la manutenzione straordinaria refers to that recognized type of work

English might translate more loosely and sometimes omit an article, but in Italian the articles sound completely natural here.

Because in Italian many adjectives, especially technical or classifying ones, normally come after the noun.

Here manutenzione straordinaria is almost a set phrase. Straordinaria is not just an extra comment; it identifies the type of maintenance.

That is why the normal order is:

• manutenzione straordinaria

not:

• straordinaria manutenzione

The second version is not the usual technical wording here.

Yes. It sounds fairly formal, technical, or administrative.

You might hear it in:

• a property inspection
• a condo meeting
• a repair estimate
• municipal or legal documentation

More everyday alternatives could be:

• La facciata ha bisogno di manutenzione straordinaria.
• Per la facciata bisogna fare lavori importanti.
• Per la facciata è necessaria la manutenzione straordinaria.

The original sentence is perfectly natural, but it has a more official tone.