Chaque copropriétaire a des tantièmes.

Because chaque means each, and in French it treats the following noun as singular. So you say chaque copropriétaire a..., not chaque copropriétaires ont....

French is focusing on each person one by one:

• Chaque étudiant a un livre.
• Chaque enfant joue.

This is similar to English Each co-owner has..., not Each co-owners have....

Copropriétaire is a noun meaning co-owner or joint owner.

It is made up of:

• co- = co-
• propriétaire = owner

In property and apartment-building contexts, it often refers to someone who owns part of a shared building, such as an apartment owner in a condominium or jointly owned property.

Here, a is the verb avoir in the il/elle/on form, meaning has.

So:

• Chaque copropriétaire a des tantièmes = Each co-owner has shares / allotted fractions.

It is not est because the sentence is expressing possession, not identity or description.

Compare:

• Il a un chien = He has a dog.
• Il est médecin = He is a doctor.

Des is the plural indefinite article, usually meaning some or simply marking a plural countable noun.

So des tantièmes means something like:

• some shares
• ownership fractions
• allotted units

You use des because tantièmes is plural and not being presented as a specific known set with les.

Very roughly:

• a des tantièmes = has ownership shares / has some allocated fractions
• a les tantièmes = has the specific shares

In property law and condominium contexts, tantièmes refers to the fractional shares assigned to each co-owner in the common parts of a building or in the co-ownership as a whole.

These shares are often used to calculate things like:

• voting rights
• maintenance charges
• responsibility for common expenses

So this is a specialized legal/property term, not an everyday word in most casual conversation.

It is plural because these ownership fractions are treated as multiple units or share-points.

In this type of legal/property language, a co-owner is assigned a certain number of tantièmes, not usually just one. So the plural is natural:

• Il a 150 tantièmes.
• Elle a 80 tantièmes.

Even if English might describe the idea more abstractly, French commonly uses the plural noun here.

Copropriétaire is pronounced approximately:

ko-pro-prye-tehr

The é in -taire gives a clear ay-like sound, not a silent e.

A rough breakdown:

• co → ko
• pro → pro
• prié → prye
• taire → tehr

The accent in é helps show that the vowel is pronounced clearly.

Not exactly. They are similar, but not identical.

• Chaque copropriétaire a des tantièmes = Each co-owner has shares.
• Tous les copropriétaires ont des tantièmes = All the co-owners have shares.

Both can be correct, but the grammar changes:

• chaque + singular noun + singular verb
• tous les + plural noun + plural verb

So if you change chaque, you also have to change the noun and verb.

Yes. Possède from posséder is possible and sounds a bit more formal or explicit.

Compare:

• Chaque copropriétaire a des tantièmes.
• Chaque copropriétaire possède des tantièmes.

Both are grammatical. In many cases, a is the simpler and more natural everyday choice, while possède may sound more precise or legalistic.

It can be either, depending on the person.

• masculine: un copropriétaire
• feminine: une copropriétaire

The written form is the same in both genders in modern usage. The article tells you the gender:

• Chaque copropriétaire can refer to any co-owner in a general sense.
• If needed, context will show whether the person is male or female.

Because French expresses this idea differently from English.

In English, the concept may be translated with phrases like:

• shares
• fractional ownership shares
• thousandths of ownership
• units of entitlement

French simply uses the noun tantièmes directly. You do not need an extra de phrase in this sentence because tantièmes itself already carries that legal/property meaning.