Az egykori iroda ma közösségi iroda.

It is understood, not spoken.

In Hungarian, the verb van = to be is usually left out in the present tense, third person singular/plural when the sentence simply says what something is.

So:

• Az egykori iroda ma közösségi iroda.
• literally: The former office today community office
• natural English: The former office is a community office today.

But in other persons, Hungarian does use the verb:

• Én tanár vagyok. = I am a teacher.
• Te tanár vagy. = You are a teacher.

And in the past tense, it also appears:

• Az iroda közösségi iroda volt. = The office was a community office.

Az is the definite article here, meaning the.

Hungarian has two forms of the definite article:

• a before a consonant sound
• az before a vowel sound

Since egykori begins with a vowel, Hungarian uses az:

• az egykori iroda

Compare:

• az iroda = the office
• a közösségi iroda = the community office

So Az egykori iroda means the former office.

Egykori means former, once, or one-time in the sense of belonging to an earlier period.

So:

• egykori iroda = former office
• egykori elnök = former president
• egykori barát = former friend / one-time friend

It is a fairly common written and spoken word, often a bit more formal or neutral than some English equivalents.

A useful thing to notice:

• egykor is an older-style adverb meaning once / formerly
• egykori is the adjective built from it

So egykori functions like an adjective before a noun.

Because közösségi iroda is the predicate noun phrase: it tells you what the subject is.

In Hungarian, when you say that something is something, the predicate noun often appears without an article.

So:

• Az egykori iroda ma közösségi iroda. = The former office is a community office today.

This is normal Hungarian structure.

If you added egy, it would slightly change the feel:

• Az egykori iroda ma egy közösségi iroda.

This is possible in some contexts, but it is less neutral here. It can sound more like it is a certain kind of office / one community office. The article is usually omitted in simple classification sentences.

Hungarian often repeats the noun naturally in sentences like this.

Here:

• az egykori iroda = the subject
• közösségi iroda = the predicate, saying what it has become/is now

So the repetition is not strange. English also allows it:

• The former office is now a community office.

Hungarian does this very straightforwardly. There is no need to avoid repetition.

Literally, közösségi means community, so közösségi iroda literally means community office.

In real usage, it can refer to a shared office or a coworking office/space, depending on context.

Breakdown:

• közösség = community
• közösségi = community-based / communal / shared
• iroda = office

So the phrase may be translated in different ways depending on the situation:

• community office
• shared office
• coworking office
• sometimes coworking space

Because both are adjectives, and in both words the ending -i helps form an adjective.

For example:

• közösség = community
• közösségi = community / communal

And:

• egykor = once, formerly
• egykori = former

The ending -i is a very common Hungarian adjective-forming ending.

Other examples:

• Budapest → budapesti = from Budapest / Budapest-based
• nyár → nyári = summer, summertime
• iskola → iskolai = school-related

So in this sentence, both words are adjectives modifying iroda.

Yes, Hungarian word order is flexible, and ma can move depending on emphasis.

Here:

• Az egykori iroda ma közösségi iroda.

This is a natural, neutral structure:

• topic: Az egykori iroda
• time word: ma
• predicate: közösségi iroda

You could also say:

• Ma az egykori iroda közösségi iroda.

This puts more attention on today.

Hungarian word order is strongly connected to topic and focus, not just fixed sentence slots like in English.

Because both instances of iroda are in the basic dictionary form, the nominative.

This sentence is an equational / identifying sentence:

• subject: az egykori iroda
• predicate noun: közösségi iroda

Neither one needs a case ending here.

Hungarian uses case endings when the noun has another role, for example:

• irodában = in the office
• irodát = office as a direct object
• irodához = to the office

But in this sentence, both are just naming what the thing is, so plain iroda is correct.

The sentence most naturally suggests a change in function or status.

• egykori iroda = the former office
• ma közösségi iroda = today it is a community/shared office

So the contrast between egykori and ma strongly implies:

• formerly it was an office in an earlier sense or role
• today it serves as a community/shared office

The exact nuance depends on context, but the sentence clearly contrasts past identity with present identity.

No. It must be az here.

Hungarian uses:

• a before consonant sounds
• az before vowel sounds

Since egykori begins with e, a vowel, the correct form is:

• az egykori iroda

Compare:

• a régi iroda
• az új iroda

So this is a sound-based rule, similar to how English uses a and an.