V osmém patře je naše kancelář.

Because Czech and English do not always use the same preposition in location expressions.

With floors, Czech normally says v patře or v osmém patře, literally using v = in. English idiomatically says on the eighth floor, but Czech prefers v.

So:

• v patře = on a floor / upstairs
• v osmém patře = on the eighth floor

This is something you usually just learn as a fixed Czech pattern.

It is in the locative case.

The preposition v takes:

• locative when it means location: in, at, on
• accusative when it means motion into something

Here the sentence describes a location, not movement, so you get locative:

• v osmém patře = in/on the eighth floor

Both words change:

• osmý → osmém
• patro → patře

It means eighth.

Czech distinguishes:

• osm = eight
• osmý = eighth

In this sentence, the word is declined because it agrees with patře in case, gender, and number:

• basic form: osmý
• locative singular masculine/neuter form: osmém

So v osmém patře means on the eighth floor, not in eight floors.

Because osmý is an adjective-like word, and it has to agree with the noun it describes.

Ordinal numbers such as first, second, eighth behave like adjectives in Czech. That means they change form depending on:

• gender
• number
• case

Here the noun is patro:

• neuter
• singular
• in the locative after v

So osmý becomes osmém.

Because patře is the locative singular form of patro.

The basic form is:

• patro = floor, storey

But after v in a location meaning, you need the locative:

• v patře
• v osmém patře

This is one of those noun forms you should memorize as a common pattern. It is not just patro with a simple ending added; the form changes to patře.

Je is the present-tense form of být = to be.

It is third person singular because the subject is naše kancelář:

• kancelář = office
• one office = singular

So:

• je = is
• jsou = are

Even though the sentence starts with the location phrase, the thing that is somewhere is naše kancelář, so singular je is correct.

Because naše has to agree with kancelář.

The noun kancelář is:

• feminine
• singular
• nominative here, because it is the subject

So the possessive adjective náš changes to the matching form:

• náš = basic form
• naše = feminine singular nominative in this sentence

That is why you get naše kancelář = our office.

Yes. In Czech, grammatical gender is not determined only by the ending.

Many feminine nouns do end in -a, but not all of them. Some feminine nouns end in a consonant, and kancelář is one of them.

You can often tell from the declension pattern:

• kancelář
• bez kanceláře
• ke kanceláři

So yes, kancelář is feminine, even though that may look surprising to an English speaker.

Yes, absolutely. That sentence is correct too.

Both versions are natural, but they shift the emphasis a little:

• Naše kancelář je v osmém patře.
  More natural if you are talking about our office and saying where it is.

• V osmém patře je naše kancelář.
  More natural if you start with the location, or if you are answering something like What is on the eighth floor?

Czech word order is more flexible than English, and word order often shows focus and information structure, not just grammar.

Because Czech does not have articles like English a/an and the.

Whether something is definite or indefinite is understood from:

• context
• word order
• possessives such as naše
• the overall situation

So Czech can simply say:

• kancelář = office / the office / an office

In this sentence, naše kancelář already clearly means a specific office, so no article is needed.

In a normal standard sentence like this, no.

Czech sometimes omits to be in very informal speech, headlines, or special styles, but in an ordinary sentence expressing location, je should stay:

• V osmém patře je naše kancelář. ✅
• V osmém patře naše kancelář. ❌ in normal standard Czech

So for learners, the safe rule is: keep je here.