العمارة اللي ساكنين فيها كبيرة، وفيها بلكونة كبيرة على الشارع.

In Egyptian Arabic, العمارة usually means an apartment building or residential building, not just any building in the most general sense.

So in this sentence, it most naturally refers to the building people live in.

It is also a feminine noun, which matters for adjective agreement later.

Because in Arabic, the verb to be is normally left out in the present tense.

So:

• العمارة كبيرة = The building is big
• literally: the building big

This is completely normal in Egyptian Arabic.

اللي is the Egyptian Arabic relative word meaning that, which, or who.

So:

• العمارة اللي ساكنين فيها = the building that ... live in

A very important point: in Egyptian Arabic, اللي is used for all genders and numbers.
Unlike Standard Arabic, it does not change form.

ساكنين means living / residing and it is a plural form.

In context, it means something like:

• they are living
• or sometimes we are living

Egyptian Arabic often leaves the subject understood from context. So ساكنين by itself does not tell you whether it is we or they; the broader context does that.

If a speaker wanted to make it explicit, they could say:

• العمارة اللي إحنا ساكنين فيها = the building we live in
• العمارة اللي هم ساكنين فيها = the building they live in

This is a very common Arabic pattern.

فيها means in it / in her, and it refers back to العمارة.

Arabic often keeps this kind of resumptive pronoun inside relative clauses, especially after a preposition like في.

So literally, the structure is closer to:

• the building that they are living in it

That sounds wrong in English, but it is normal in Arabic.

Here فيها means something like it has or more literally in it there is.

So:

• وفيها بلكونة كبيرة
  literally: and in it, there is a big balcony
• natural English: and it has a big balcony

This is a very common Arabic way to express that something contains or has something.

Because both nouns it describes are feminine:

• العمارة → feminine
• بلكونة → feminine

So the adjective must also be feminine:

• كبيرة = big for feminine nouns

You see it twice:

• العمارة ... كبيرة = the building is big
• بلكونة كبيرة = a big balcony

If the noun were masculine, you would normally get كبير instead.

Yes. بلكونة is a very common Egyptian Arabic word meaning balcony.

It is a colloquial everyday word, and it is treated as feminine.

In more formal Standard Arabic, you might often see شرفة instead.
But in Egyptian speech, بلكونة is extremely natural.

Literally, yes, على الشارع is on the street.

But in this kind of sentence, the natural meaning is:

• facing the street
• overlooking the street
• on the street side

So بلكونة كبيرة على الشارع means the balcony faces the street, not that it is physically sitting on top of the street.

Not exactly.

This sentence is clearly Egyptian Arabic, especially because of words like:

• اللي
• بلكونة

A more Standard Arabic version would look different, for example:

• العمارة التي يسكنون فيها كبيرة، وفيها شرفة كبيرة تطل على الشارع.

So if you are learning Egyptian, the original sentence is natural and correct for everyday speech.

A simple pronunciation guide is:

el-ʿamāra illi sāknīn fīha kibīra, wə-fīha balkōna kibīra ʿala sh-shāreʿ.

A few useful notes:

• اللي is often pronounced illi or elli
• ساكنين sounds like sāknīn
• وفيها often sounds like wə-fīha
• الشارع has doubled sh in pronunciation because of the ال before ش:
  ash-shāreʿ or sh-shāreʿ after على

So على الشارع is commonly heard as ʿala sh-shāreʿ.