Osim stanarine, svaki mjesec plaća i pričuvu za zgradu.

Because osim normally requires the genitive case.

• base form: stanarina = rent
• after osim: osim stanarine = apart from / besides the rent

So this is a case change, not a different word.

Osim usually means apart from, besides, or except for, depending on context.

In this sentence, it means besides or in addition to.

A useful rule:

• osim + genitive

Examples:

• osim mene = besides me
• osim škole = besides school
• osim stanarine = besides the rent

Croatian often drops subject pronouns because the verb ending already tells you the person and number.

• plaćam = I pay
• plaćaš = you pay
• plaća = he/she/it pays

So plaća by itself already means he/she pays.
The exact subject usually comes from context.

Yes. Plaća can be:

1. a verb form: he/she pays
2. a noun: salary

In this sentence, it is clearly the verb, because it is followed by objects:

• plaća pričuvu = pays the reserve fund / maintenance fee

If it were the noun salary, the sentence structure would be different.

Croatian uses the present tense for habitual actions, just like English does in sentences such as He pays every month.

The phrase svaki mjesec shows that this is something repeated regularly, so plaća is best understood as a habitual present:

• every month, he/she pays...

Yes, both are possible.

• svaki mjesec = every month
• svakog mjeseca = every month / each month

In this sentence, svaki mjesec is very natural. It uses the accusative of time, which is common for repeated time expressions.

A useful thing to notice:

• mjesec looks the same in nominative and accusative singular
• svaki also looks the same here

So even though there is case involved, you do not see much change in the form.

Here i means also / too, not just and.

The sentence is saying that, besides the rent, the person also pays another charge.

So:

• plaća i pričuvu = also pays the reserve fund / maintenance fee

Without i, the sentence would still be understandable, but i makes the additive idea clearer.

Because pričuva is the direct object of plaća, so it has to be in the accusative case.

• nominative: pričuva
• accusative: pričuvu

This is a regular pattern for many feminine nouns ending in -a:

• žena → ženu
• knjiga → knjigu
• pričuva → pričuvu

In Croatian housing vocabulary, pričuva usually means a building reserve fund contribution or maintenance reserve fee.

It is money residents/owners pay regularly for shared building costs such as:

• repairs
• maintenance
• common areas
• future building expenses

So it is not the same as stanarina (rent). It is an additional housing-related payment.

Here za means for, and it takes the accusative case.

• base form: zgrada = building
• after za: za zgradu = for the building

So pričuva za zgradu means the reserve fund / maintenance fee for the building.

Yes. Croatian word order is fairly flexible, and changing it often changes emphasis, not the core meaning.

The given sentence is natural:

• Osim stanarine, svaki mjesec plaća i pričuvu za zgradu.

Possible variants:

• Svaki mjesec osim stanarine plaća i pričuvu za zgradu.
• Plaća i pričuvu za zgradu svaki mjesec, osim stanarine.
  This is less neutral and sounds more marked.

The original version is a good neutral choice, especially if you want to highlight apart from the rent at the start.

The comma here mainly helps mark the introductory phrase and makes the sentence easier to read.

It does not change the basic grammar or meaning. In real-life writing, punctuation around short introductory phrases can vary somewhat, but with the comma the sentence feels clearly segmented:

• Osim stanarine, = introductory phrase
• svaki mjesec plaća i pričuvu za zgradu = main clause

So the comma is best understood as a punctuation choice that improves clarity and rhythm.