Юридический адрес указан у стойки администратора.

Указан is the short-form passive participle of указать (to indicate / to specify).

In this sentence, it means something like:

• is indicated
• is listed
• is specified

So Юридический адрес указан... literally means The legal address is indicated/listed...

This is a very common Russian way to express a resulting state:

• адрес указан = the address is given/listed
• дата указана = the date is given/listed

It is not the same as указывает, which would mean indicates as an active verb, as in The sign indicates the entrance.

In Russian, the verb to be is normally omitted in the present tense.

So where English says:

• The legal address is indicated at the reception desk

Russian simply says:

• Юридический адрес указан у стойки администратора.

This is completely normal. Russian does not usually insert a present-tense есть in sentences like this.

Юридический адрес is in the nominative singular.

Why?

• адрес is the main noun
• юридический agrees with it
• this phrase is the grammatical subject of the sentence

You can think of it as:

• What is indicated? → юридический адрес

Because адрес is masculine singular, the adjective also appears in masculine singular form:

• юридический адрес

Yes. Указан agrees with адрес in gender and number.

Since адрес is masculine singular, we get:

• адрес указан

Compare:

• улица указана — feminine singular
• место указано — neuter singular
• данные указаны — plural

So the form changes depending on the noun being described.

У стойки means by the desk / near the desk / at the desk.

The preposition у usually means:

• by
• near
• next to
• sometimes idiomatically at

So у стойки администратора means at the receptionist’s desk / by the reception desk.

Why not на стойке?

• на стойке would mean on the desk/counter
• у стойки means at the desk / by the counter area

So if the address is posted or available in the reception area, у стойки is the natural phrasing.

Because the preposition у requires the genitive case.

The dictionary form is:

• стойка = desk, counter

After у, it becomes:

• у стойки

This is the genitive singular form.

So:

• у стойки = by the desk / at the desk

Here администратора depends on стойка and means something like:

• the administrator’s desk
• the receptionist’s desk

The pattern is:

• стойка администратора

Literally: desk of the administrator

This is a very common noun + noun structure in Russian, where the second noun goes into the genitive to show relationship.

Other examples:

• дверь комнаты = the room’s door / the door of the room
• номер телефона = phone number
• кабинет врача = doctor’s office

So стойка администратора is literally administrator’s desk, though in natural English we often say reception desk.

Often, yes in practice, but not word-for-word.

Literally, стойка администратора is:

• the administrator’s desk/counter

In many real-life contexts, that is exactly what English would call the reception desk or front desk.

So depending on context, a natural translation could be:

• at the reception desk
• at the front desk
• at the administrator’s desk

Yes. Russian word order is more flexible than English word order.

This sentence:

• Юридический адрес указан у стойки администратора.

is neutral and natural.

But you could also say:

• У стойки администратора указан юридический адрес.

This puts more emphasis on the location.

Or:

• У стойки администратора юридический адрес указан.

This is possible too, though it may sound more marked or context-dependent.

So the word order can shift for emphasis, but the original version is a good neutral model.

Yes, depending on the exact nuance.

Possible alternatives include:

• написан = written
• размещён = posted / placed
• приведён = provided / given
• есть or находится in some different structures

For example:

• Юридический адрес написан у стойки администратора.
  = The legal address is written at the reception desk.

• Юридический адрес размещён у стойки администратора.
  = The legal address is posted/placed at the reception desk.

But указан is especially good when the idea is that the address is officially given or listed somewhere.

A native speaker would probably understand it as something like:

• The legal address is listed at the reception desk.
• You can find the legal address at the reception desk.
• The legal address is indicated by the reception desk.

So even though the Russian is structurally close to The legal address is indicated at the administrator’s desk, the practical meaning is often that the information is available there or posted there.

The main stress pattern is:

• юриди́ческий а́дрес ука́зан у сто́йки администра́тора

Word by word:

• юриди́ческий
• а́дрес
• ука́зан
• сто́йки
• администра́тора

For an English speaker, the hardest part is often юриди́ческий and администра́тора, because they are long and have unstressed vowels that get reduced in pronunciation.