Doklad opravňující užívání objektu může být nájemní smlouva.

Opravňující means authorizing, entitling, or giving the right to.

Grammatically, it is a present active participle formed from the verb opravňovat. In this sentence, it behaves a bit like an adjective and describes doklad:

• doklad = document
• opravňující = authorizing / entitling

So doklad opravňující... means a document that authorizes...

This is a fairly formal style, common in administrative and legal Czech.

In Czech, descriptive words and phrases often come after the noun, especially in formal written language.

So:

• doklad opravňující užívání objektu

literally means:

• document authorizing the use of the object/building

This is similar to English formal phrases like documents required, person responsible, etc.

A less condensed version could use a relative clause:

• doklad, který opravňuje k užívání objektu

That means roughly a document that entitles one to use the building/property.

Užívání is a verbal noun, meaning use or using.

Czech, especially formal or legal Czech, often prefers nouns like this instead of a full clause. So instead of saying something like:

• doklad, který opravňuje někoho užívat objekt

you often get the more compact official style:

• doklad opravňující užívání objektu

This makes the sentence sound more bureaucratic or legal, which is very typical.

Objektu is genitive singular of objekt.

It depends on užívání:

• užívání objektu = use of the building/property/object

This is very common in Czech: when an action is turned into a noun, the thing affected by that action is often put in the genitive.

Compare:

• užívat objekt = to use the building/property
• užívání objektu = the use of the building/property

So the case changes because the verb has become a noun.

Doklad is a very common Czech word meaning document, proof, certificate, or supporting document, depending on context.

In official language, it often means a document that proves something, for example:

• identity
• ownership
• permission
• legal right to use something

So in this sentence, doklad is not just any paper. It means a document that serves as evidence that someone is allowed to use the property.

Because it comes after být and works as a predicate noun.

The structure is:

• Doklad ... může být nájemní smlouva.

Both doklad and nájemní smlouva are in the nominative:

• doklad = nominative singular
• nájemní smlouva = nominative singular

This is normal with být:

• To je dům.
• Petr je učitel.
• Doklad může být nájemní smlouva.

So the sentence is literally: The document may be a lease agreement.

Both are possible, but the emphasis changes.

The original order:

• Doklad opravňující užívání objektu může být nájemní smlouva.

puts the focus first on what kind of thing is required: a document authorizing use of the property. Then it tells you what can count as such a document: a lease agreement.

So the final part:

• nájemní smlouva

is the important new information.

If you said:

• Nájemní smlouva může být doklad opravňující užívání objektu.

that would sound more like you are talking specifically about a lease agreement and explaining what role it can serve.

Czech word order is flexible, and it often reflects emphasis rather than strict grammatical rules.

Nájemní smlouva means lease agreement, rental contract, or tenancy agreement, depending on context.

It is made up of:

• nájemní = rental / lease-related
• smlouva = contract / agreement

So literally it is a lease contract.

In practical English, you would often translate it as:

• lease agreement
• rental agreement
• tenancy agreement

The best choice depends on the legal context.

Not usually in the everyday English sense of object.

In official Czech, objekt often means:

• building
• property
• premises
• sometimes facility

So užívání objektu usually means something like:

• use of the building
• use of the premises
• occupation/use of the property

A direct translation as object is often too mechanical in English.

Because Czech has no articles.

So:

• doklad can mean a document or the document
• nájemní smlouva can mean a lease agreement or the lease agreement

You understand which one is meant from context.

That is why the sentence can naturally be translated as either:

• A document authorizing use of the property may be a lease agreement or
• The document authorizing use of the property may be a lease agreement

In most contexts here, English would probably prefer a.

It is natural, but it sounds formal and administrative, not conversational.

Features that make it formal include:

• opravňující as a participle
• užívání as a verbal noun
• the overall compact, legal-document style

In everyday speech, Czech speakers might use a fuller, simpler sentence. But in regulations, applications, instructions, and official documents, this style is very common.

So yes, it is natural Czech, just in a bureaucratic register.