Kat mülkiyeti ortak alanı da içeriyor.

Yes, kat literally means floor/story in a building, and mülkiyet means ownership or property ownership.

But together, kat mülkiyeti is a set legal expression. It usually refers to condominium ownership, apartment ownership, or strata title—ownership of an individual unit in a building, along with related legal rights.

So in this sentence, it is best understood as a legal/property term, not just floor ownership in a literal word-by-word sense.

Here, ortak alanı is the direct object of içeriyor (includes), and it is a definite/specific object.

• ortak alan = common area
• ortak alanı = the common area / common area as a definite object

That final -ı is the accusative case ending.

Compare:

• ortak alan içeriyor = includes a common area / includes common area
• ortak alanı içeriyor = includes the common area

So the -ı shows that a specific common area is being referred to.

It can be in other contexts, because Turkish forms can sometimes look the same. But in this sentence, the natural reading is the accusative object:

• ortak alanı = the common area as the thing being included

Why? Because it comes right before içeriyor, and içermek takes a direct object. So learners should read it here as an object with the accusative ending, not as a possessive form.

Here da means also or too.

So:

• ortak alanı da = the common area too / also the common area

This suggests that kat mülkiyeti includes something else as well, and the common area is an additional thing included.

A key point: this da is a separate word, not a suffix, even though it is written right after the previous word:

• correct: alanı da
• not: alanıda

In Turkish, da usually comes right after the word or phrase it emphasizes.

So:

• ortak alanı da içeriyor = it includes the common area too

The focus is on ortak alanı.

If you moved da, the emphasis could change:

• Kat mülkiyeti de ortak alanı içeriyor = condominium ownership too includes the common area
  (maybe in contrast with something else)

So the position of da helps show what is being highlighted.

İçeriyor comes from the verb içermek, which means to include or to contain.

The form içeriyor is the present continuous form, literally something like is including, but in Turkish this form is very commonly used for general present meaning too.

So in natural English, you would usually translate it simply as:

• includes

even though the Turkish form is the one normally called the present continuous.

Yes, Kat mülkiyeti ortak alanı da içerir is also possible.

The difference is roughly:

• içerir = more formal, general, rule-like, written style
• içeriyor = very common in everyday speech and modern standard usage

In many real-life contexts, especially explanatory speech or ordinary writing, içeriyor sounds perfectly natural.

Turkish word order is flexible, but the neutral pattern is often:

• Subject + Object + Verb

So here:

• Kat mülkiyeti = subject
• ortak alanı da = object + also
• içeriyor = verb

That gives:

• Kat mülkiyeti ortak alanı da içeriyor.

English usually prefers:

• Subject + Verb + Object
• Condominium ownership also includes the common area.

So the Turkish sentence is normal; it just follows Turkish structure rather than English structure.

Turkish does not have articles like English a/an and the.

Instead, definiteness is often shown by context and by grammar. In this sentence, the accusative ending -ı in ortak alanı helps signal that the object is definite/specific.

So Turkish expresses something that English would often show with the, but it does it differently.

Literally, ortak alan is singular: common area.

In real usage, especially in legal or property language, a singular noun in Turkish can sometimes refer to the category in a general sense. Depending on context, English may translate it as:

• the common area
• common areas
• shared/common space

But grammatically, the Turkish form here is singular.

A rough pronunciation guide:

• Kat mülkiyeti ortak alanı da içeriyor
• kaht muhl-kee-YEH-tee or-TAHK ah-lah-NUH dah ee-cheh-REE-yor

A few helpful points:

• ü sounds somewhat like the u in French tu or German über
• ı is a vowel English does not really have; it is like a relaxed, unrounded uh/i sound
• ç = ch
• ş = sh
• c = j as in jam

A natural translation would be:

• Condominium ownership also includes the common area.

Depending on context, you might also say:

• Condominium ownership includes the common area as well.
• Flat ownership also covers the common area.
• Strata title also includes common areas.

The best choice depends on whether you want a legal, everyday, British, or American phrasing.