zimu ha kaisya no tikaku desu.

When は is used as the topic particle, it is pronounced wa.

So in ジム は 会社 の 近く です, you read it as:

ジム wa 会社 no 近く desu

This is a historical spelling convention in Japanese. The character is still written は, but in this grammar role it is pronounced wa.

As part of an ordinary word, は is usually pronounced ha.

は marks the topic of the sentence.

Here, ジムは means something like:

• As for the gym...
• Speaking of the gym...

Then the rest of the sentence says something about that topic.

This is slightly different from an English subject marker. In many simple sentences, the topic and subject happen to line up, but は is best understood as setting the thing you are talking about.

の links nouns together.

In this sentence, 会社の近く literally means:

• the company’s nearby area
• the area near the company

So の is connecting 会社 and 近く.

A very common way to think of の is:

• possession: 田中さんの本 = Tanaka’s book
• category/description: 日本の車 = Japanese car
• location relationship like this: 駅の前 = in front of the station, 家の中 = inside the house, 会社の近く = near the company

Here, 近く is being used as a noun, meaning nearby area or vicinity.

That is why it can come after の:

• 会社の近く = the vicinity of the company / near the company

This is different from 近い, which is an i-adjective meaning near.

Compare:

• ジムは会社の近くです
  The gym is near the company.

• ジムは会社に近いです
  The gym is close to the company.

Both are natural, but the grammar is different.

Because this sentence is using the noun expression 近く.

With 近く as a noun, the standard pattern is:

• place + の + 近く
  会社の近く = near the company

If you use に, you usually need a different structure, such as the adjective 近い:

• 会社に近いです = is close to the company

So:

• 会社の近くです uses a noun phrase
• 会社に近いです uses an adjective phrase

Both are correct, but they are built differently.

Because 近く is the predicate noun here, followed directly by です.

The structure is:

• ジム は [会社 の 近く] です

The whole bracketed part is what the gym is.

This is similar to other noun-predicate sentences:

• 田中さんは先生です
• ここは駅です

In the same way:

• ジムは会社の近くです

If 近く were part of a location phrase for an existence verb, then you would often see に:

• ジムは会社の近くにあります
  The gym is near the company.

So the particle depends on the grammar pattern being used.

In beginner explanations, it is often taught that です works like is / am / are, and that is a useful way to understand it.

More precisely, です is the polite copula-like ending used to make the sentence polite and complete.

So in this sentence:

• ジムは会社の近くです

です is what makes the sentence end politely, similar in function to is in English.

A rough literal breakdown would be:

• As for the gym, it is the vicinity of the company

That sounds unnatural in English, but grammatically it shows why です appears there.

Yes, you can.

• ジムは会社の近くです
• ジムは会社の近くにあります

Both can mean that the gym is near the company.

The difference is mainly in grammar and nuance:

• 近くです is a simple descriptive statement
• 近くにあります explicitly uses the existence/location verb あります

The version with あります can sound a little more like stating where something is located. The です version is very common and natural too.

Because ジム is a loanword, borrowed from English gym.

Katakana is commonly used for:

• foreign loanwords
• some onomatopoeia
• emphasis
• scientific names, depending on context

So ジム is written in katakana instead of hiragana or kanji.

Also, in Japanese, ジム often refers to a fitness gym or fitness club. It may not always match every use of English gym exactly.

No. Normally, Japanese is written without spaces.

So the sentence would usually appear as:

ジムは会社の近くです。

Spaces are often added in beginner materials to make the parts easier to read.

It is polite because it ends in です.

This is a neutral, standard sentence style that is appropriate in many situations.

A more casual version would be:

• ジムは会社の近くだ。
• ジムは会社の近くだよ。

So the sentence you were given is a good everyday polite form.

Yes, if the topic is already clear from context.

Japanese often leaves out information that both speakers already understand.

So if everyone already knows you are talking about the gym, you might just say:

• 会社の近くです。

That would mean something like:

• It’s near the company.

This kind of omission is very common in natural Japanese.

Japanese does not have articles like English a and the.

So ジム, 会社, and 近く appear without article words.

Whether something is a gym, the gym, a company, or the company is usually understood from context.

That is why one short Japanese sentence can correspond to different English versions depending on the situation.