Опенспейс уже открыт.

Russian usually omits the verb to be in the present tense.

So where English says The open space is already open, Russian simply says:

Опенспейс уже открыт.

This is completely normal.
If you wanted past or future, then a form of быть would appear:

• Опенспейс уже был открыт. = The open space was already open / had already been opened.
• Опенспейс уже будет открыт. = The open space will already be open.

Открыт is the short form of открытый.

In Russian, short-form adjectives are often used to describe a state:

• дверь открыта = the door is open
• магазин открыт = the shop is open
• опенспейс открыт = the open-plan area is open

By contrast, открытый is the full form, and it more often describes a noun directly:

• открытый офис = an open office
• открытое пространство = an open space

So in this sentence, открыт is used because it means is open, not open as a descriptive attribute before a noun.

For learners, the most useful answer is: it behaves like a short-form adjective meaning open or opened in a resulting state.

Historically, it is related to a participle, and grammars may describe it as a short passive participle in some contexts. But in everyday learning, it is often easiest to understand sentences like this as expressing a state:

• Магазин открыт. = The store is open.
• Окно открыто. = The window is open.

So here, открыт tells you the current condition of опенспейс.

Yes, it agrees with опенспейс, which is treated as masculine singular.

Short-form forms change by gender and number:

• masculine: открыт
• feminine: открыта
• neuter: открыто
• plural: открыты

Examples:

• Дверь уже открыта. = The door is already open.
• Окно уже открыто. = The window is already open.
• Магазины уже открыты. = The stores are already open.

Since опенспейс is masculine, открыт is the correct form.

Уже usually means already.

In this sentence it shows that the state has been reached earlier than expected or by this point:

• Опенспейс открыт. = The open-plan area is open.
• Опенспейс уже открыт. = The open-plan area is already open.

It often adds a sense like by now, at this point, or so soon depending on context.

Yes, Russian word order is flexible, but the neutral order here is:

Опенспейс уже открыт.

Other orders are possible, but they sound different in emphasis:

• Уже опенспейс открыт.
  This strongly emphasizes already and may sound marked or contrastive.

• Опенспейс открыт уже.
  Possible in speech, often with special intonation, but less neutral.

For most learners, subject + уже + short-form predicate is the safest choice here.

Опенспейс is a borrowing from English open space / open-plan office. In modern Russian, especially in business or office contexts, it is commonly used to mean an open-plan workspace.

It is fairly colloquial and modern-sounding. Depending on context, people might also say things like:

• офис open space
• открытое пространство
• офис открытого типа

But опенспейс is widely understandable in many urban and office environments.

Many speakers treat опенспейс as a regular masculine noun and decline it, especially in everyday usage.

Possible forms include:

• nominative: опенспейс
• genitive: опенспейса
• dative: опенспейсу
• accusative: опенспейс
• instrumental: опенспейсом
• prepositional: об опенспейсе

For example:

• В опенспейсе шумно. = It’s noisy in the open-plan area.
• Нет опенспейса. = There is no open-plan area.

Borrowed words can vary in how firmly they are integrated, but this pattern is common.

In this sentence, the most natural reading is open as a current state.

Опенспейс уже открыт usually means the area is now open/accessible/available.

Russian short forms like открыт can sometimes blur the line between:

• is open
• has been opened

But without extra context, learners should understand this as a state, not focus on the action itself.

If you wanted to stress the action of opening by someone, Russian would often use a verb form instead, for example:

• Опенспейс уже открыли. = They already opened the open-plan area.
• Опенспейс уже был открыт. = The open-plan area had already been opened.

A practical pronunciation guide is:

Опенспейс уже открыт
≈ OH-pen-speys oo-ZHE ak-KRYT

A few notes:

• уже is stressed on the second syllable: ужЕ
• открыт is stressed on the last syllable: открЫт
• опенспейс usually keeps a pronunciation close to the English-based form, adapted to Russian sounds

If you want to sound more natural, pay special attention to the stress in уже and открыт.

Normally, no, not in this meaning.

Открытый is the full form, so Опенспейс уже открытый sounds unnatural if you mean The open-plan area is already open.

Use:

Опенспейс уже открыт.

You would use открытый when it directly modifies a noun:

• Это открытый офис. = This is an open office.
• Мы работаем в открытом пространстве. = We work in an open space.

So for a present state after is, the short form открыт is the natural choice.

That depends on context, but this sentence is quite possible, especially in modern office speech.

Still, depending on what exactly is meant, a native speaker might also say:

• Опенспейс уже открыт для сотрудников. = The open-plan area is already open for employees.
• В опенспейс уже можно заходить. = You can already go into the open-plan area.
• Офис уже открыт. = The office is already open.

So Опенспейс уже открыт is grammatical and understandable, but in real life, speakers may choose a more specific noun if needed.