وفقا لخطة الإخلاء، يخلي الفريق المبنى.

Yes. وفقًا لـ is a very common formal expression meaning according to or in accordance with.

A learner should usually memorize it as a chunk:

• وفقًا لـ ... = according to ...

In normal undiacritized writing, it often appears as وفقا ل or attached as وفقًا لـ.

Because the expression is normally وفقًا لـ..., not just وفقًا ....

That لِـ introduces the thing being followed or referred to:

• وفقًا لخطة الإخلاء = according to the evacuation plan

Grammatically, لِـ is a preposition, so the noun after it is in the genitive case.

This is an iḍāfa construction, often called a possessive or of- construction.

• خطة = plan
• الإخلاء = the evacuation
• خطة الإخلاء = the evacuation plan / literally plan of the evacuation

In an iḍāfa:

• the first noun usually does not take الـ
• the second noun can be definite with الـ
• the whole phrase can still be definite

So خطة الإخلاء is correct.
الخطة الإخلاء is not standard MSA.

الإخلاء is a verbal noun (also called a maṣdar).

It comes from the verb أخلى = to evacuate / to empty / to vacate.

So:

• أخلى = he evacuated
• الإخلاء = evacuation

That is why خطة الإخلاء means evacuation plan.

Yes. Here يخلي is the imperfect form of أخلى.

• past: أخلى
• imperfect/present: يُخلي

So يخلي الفريق المبنى means the team evacuates the building.

A common point for learners: the initial hamza of أخلى does not stay at the beginning in the imperfect. Instead, the imperfect uses the normal person prefix:

• يُـ for he/it
• so أخلى becomes يُخلي

In unvocalized text, this appears simply as يخلي.

Because verb–subject–object order is very common in MSA.

So:

• يخلي الفريق المبنى = verb + subject + object

Arabic can also say:

• الفريق يخلي المبنى

That version is also correct, but it sounds more like the team is the topic or point of emphasis. The version in your sentence is a very normal formal written order.

There are two main clues:

1. Word order

   • after the verb, the first noun is often the subject
   • the next noun is often the object

2. Grammar/case

   • الفريقُ would be nominative as the subject
   • المبنى is the direct object

In everyday writing, short vowels are usually omitted, so learners often have to rely on syntax and meaning. Here the natural reading is:

• الفريق = the one doing the action
• المبنى = the thing being evacuated

Because this noun ends in alif maqṣūra (ى), not a regular ي.

The word is pronounced roughly al-mabnā.

This final ى often appears in nouns whose last root letter is historically ي. It does not mean there is a written y sound at the end; here it represents a final long ā sound.

So:

• المبنى = the building
• pronunciation: al-mabnā

Because nouns ending in ى often do not show visible case endings in the usual spelling.

So even though المبنى is the direct object here, its form stays the same in writing.

That means:

• subject form may look the same
• object form may look the same
• you understand the role from syntax and context

This is very common in Arabic, especially in texts without full vowel marking.

In MSA, the imperfect verb can do more than just describe something happening right now.

It can also express:

• a general rule
• a planned action
• a procedural step
• an instruction stated in neutral formal style

So in a context like an evacuation plan, يخلي can mean something like:

• evacuates
• is to evacuate
• will evacuate, depending on context

This is why the present tense sounds natural here. It is common in formal instructions and procedural language.