La sede dell’azienda è vicina alla stazione.

Because sede is a feminine noun in Italian, even though it ends in -e.

Many Italian nouns ending in -e can be either masculine or feminine, so you often just have to learn their gender with the word:

• la sede = the headquarters / the office / the seat
• plural: le sedi

That is why the sentence uses:

• la sede
• vicina (feminine form of the adjective)

In this sentence, sede usually means headquarters, main office, or company office/site, depending on context.

So la sede dell’azienda can mean:

• the company headquarters
• the company office
• the company’s premises/location

It does not usually mean just any random “seat.” Italian sede has a wider range than English seat, and in business contexts it often refers to an office or headquarters.

Because Italian often expresses of the company using di + article.

• dell’azienda = of the company
• It comes from di + l’azienda
• These combine into dell’azienda

So:

• la sede dell’azienda = the company’s headquarters / the headquarters of the company

Italian often prefers this structure where English might use ’s:

• il libro di Marco = Marco’s book
• la sede dell’azienda = the company’s headquarters

Because the noun azienda is feminine singular and begins with a vowel.

The full article is:

• la azienda

But in Italian, la usually shortens before a vowel:

• l’azienda

Then with di:

• di + l’azienda = dell’azienda

So the apostrophe shows that la has been shortened.

Because è is the verb is from essere.

• è = is
• e = and

The accent matters a lot:

• La sede dell’azienda è vicina... = The company headquarters is near...
• La sede dell’azienda e vicina... would be incorrect

So the accent helps distinguish the verb from the conjunction.

Because adjectives in Italian usually agree with the noun they describe.

Here, vicina describes la sede, which is:

• singular
• feminine

So the adjective must also be singular feminine:

• vicina

Compare:

• la sede è vicina
• l’ufficio è vicino (masculine singular)
• le sedi sono vicine (feminine plural)
• gli uffici sono vicini (masculine plural)

Vicino/vicina normally goes with the preposition a, meaning near to.

So:

• vicina a = near
• vicino a qualcosa = near something

In your sentence:

• vicina alla stazione
• literally: near to the station

This is very common in Italian:

• La banca è vicina al supermercato.
• Siamo vicini al centro.

Because it is a + la stazione.

• a = to / at / near-to, depending on context
• la stazione = the station

These combine:

• a + la = alla

So:

• vicina alla stazione = near the station

This kind of contraction is very common in Italian:

• a + il = al
• a + lo = allo
• a + la = alla
• a + l’ = all’
• a + i = ai
• a + gli = agli
• a + le = alle

Because the adjective vicino/vicina requires a, not di.

So Italian says:

• vicino alla stazione not
• vicino della stazione

Think of it as a fixed pattern:

• vicino a = near
• lontano da = far from

Examples:

• abito vicino al parco
• la scuola è vicina alla piazza

Yes, both are normal.

• La sede dell’azienda è vicina alla stazione.
• La sede è vicina alla stazione.

The longer version includes dell’azienda to specify which headquarters/office you mean.

Italian word order here is very standard:

1. subject: La sede dell’azienda
2. verb: è
3. adjective/complement: vicina alla stazione

You usually would not move things around unless you want special emphasis.

Not always, but very often that is the default meaning.

Stazione can mean:

• train station
• station in other contexts, such as police station, service station, etc., usually with more words added

By itself, la stazione most commonly means the train station in everyday speech.

Because Italian uses definite articles more often than English does.

In this sentence you have:

• La sede
• dell’azienda
• alla stazione

English might say:

• The company headquarters is near the station

Italian naturally keeps the articles inside these combinations:

• la sede
• dell’ azienda
• alla stazione

This is normal and not overly formal.

It would be:

• Le sedi dell’azienda sono vicine alla stazione.

Changes:

• la sede → le sedi
• è → sono
• vicina → vicine

This shows the same agreement pattern:

• feminine singular: la sede è vicina
• feminine plural: le sedi sono vicine