LogFAQs > #913771094

https://www.apartments.com/blog/difference-between-renting-an-apartment-or-condo

Whats the difference between an apartment and a condo? In terms of physical attributes, nothing. The difference stems from ownership, with apartment units housed within a complex owned by a single entity, often a corporation, and then leased out to individual tenants. Condo units are owned by individuals and usually then managed under the umbrella of that condo communitys homeowner association (HOA), often with the assistance of a property-management company. So when you rent a condo, the individual condo owner is your landlord.

I think flat might be both apartment and condo in British English