keiyaku no mae ni, mado ya eakon no zyoutai wo itiou kakuninsite okimasu.

前に means before.

So:

• 契約 = contract / signing the contract
• 契約の前に = before the contract
• 契約の前に、... = Before signing the contract, ...

The の connects the noun 契約 with 前:

• X の 前 = the front/before of X
• In time expressions, this becomes before X

The particle に marks the time point before which the action happens.

So 契約の前に literally means something like at the time before the contract.

The comma just separates the introductory time phrase from the main action:

• 契約の前に、 = Before the contract,
• 窓やエアコンの状態を一応確認しておきます。 = I’ll check the condition of the windows and air conditioner just in case / beforehand.

Japanese commas are often used more flexibly than English commas. This comma helps readability, but the sentence could still be understood without it.

や is used to give a non-exhaustive list.

So:

• 窓やエアコン = windows, air conditioners, and things like that
• It suggests these are examples, not necessarily the complete list.

Compare:

• 窓とエアコン = the windows and the air conditioner
  This sounds like a complete, specific list.
• 窓やエアコン = things like the windows and air conditioner
  This sounds more natural when naming representative items to check.

So や is often used when the speaker is listing some relevant examples rather than everything.

Here, の shows possession/relationship:

• 窓やエアコン = windows and air conditioner(s)
• 状態 = condition / state
• 窓やエアコンの状態 = the condition of the windows and air conditioner

So this の works like English of or a possessive relationship.

状態 means condition, state, or how something is.

In this sentence, it refers to whether the windows and air conditioner are okay, working properly, damaged, clean, etc.

So 窓やエアコンの状態を確認する means:

• check whether they work properly
• check for damage or problems
• confirm what shape they are in before agreeing to the contract

を marks the direct object of the verb.

The verb here is 確認しておきます and the thing being checked is:

• 窓やエアコンの状態 = the condition of the windows and air conditioner

So:

• 状態を確認する = to check the condition

That is why を is used.

一応 is a very common word, and here it means something like:

• for now
• just to be safe
• at least
• as a precaution
• just in case

In this sentence, 一応確認しておきます suggests:

• I’ll check it anyway
• I’ll make sure beforehand
• I’ll confirm it just in case there’s a problem

It often softens the action and makes it sound practical rather than dramatic.

Important nuance: 一応 does not usually mean the check is careless. It often means I should at least do this much before proceeding.

This is one of the most important points in the sentence.

• 確認します = I will check / confirm
• 確認しておきます = I will check in advance / I will check and have it done beforehand

The pattern 〜ておく means:

• do something in preparation
• do something beforehand
• leave something done for later convenience

So:

• 契約の前に確認します = I’ll check before the contract.
• 契約の前に確認しておきます = I’ll check beforehand so that it’s taken care of before the contract.

The second one emphasizes preparation.

〜ておく attaches to the て-form of a verb and means do something in advance or do something and leave it that way.

Examples:

• 読んでおく = read in advance
• 買っておく = buy beforehand
• 準備しておく = prepare ahead of time
• 確認しておく = check in advance

In your sentence:

• 確認する → 確認しておく
• polite form: 確認しておきます

So the speaker is not merely checking; they are checking as preparation for the contract.

おきます is the polite non-past form.

Here that usually means:

• a future action: I will check
• or a habitual/intended action depending on context

Compare:

• 確認しておく = plain dictionary form
• 確認しておきます = polite form
• 確認しておきました = polite past, I checked beforehand

Since the sentence describes what the speaker will do before the contract, 確認しておきます is natural.

Japanese often omits the subject when it is clear from context.

So this sentence does not explicitly say:

• I
• we
• the landlord
• the agent

But the verb ending 〜ます often suggests the speaker is talking about their own action in a polite way unless context says otherwise.

So the implied subject is most naturally:

• I will check... or
• we will check...

Japanese leaves this unstated because it is often unnecessary.

It could be either, depending on context.

Japanese nouns usually do not change form for singular/plural:

• エアコン can mean air conditioner or air conditioners
• 窓 can mean window or windows

English translations choose singular or plural based on the situation. If this is about one apartment, the windows and the air conditioner may sound most natural.

That is standard Japanese writing.

• 確認 is commonly written in kanji
• しておきます is usually written in hiragana

This is because:

• content words like nouns and verb stems are often written in kanji
• grammatical endings and helper verbs are often written in hiragana

So 確認しておきます is a normal mixed-script spelling.

You might also sometimes see contractions in casual speech/writing:

• 確認しときます instead of 確認しておきます

But 確認しておきます is the more careful, standard form.

It is polite, but not extremely formal.

Reasons:

• It uses 〜ます
• It uses the common business/practical expression 確認しておきます

So it is suitable for ordinary polite conversation, including housing-related or business-related situations.

If someone wanted to sound more formal, they might use more formal vocabulary or phrasing, but this sentence is already very natural and polite.

It can imply either, depending on context.

In a sentence like this, 契約の前に most naturally means:

• before entering into the contract
• before signing the contract

So although 契約 literally means contract, in context it often includes the event of making/signing the agreement.

That is very common in Japanese. A noun can stand for both the thing and the event related to it when the meaning is obvious.