épületbl
The term "épületbl" appears to be a misspelling or a non-standard abbreviation. In Hungarian, the word for building is "épület." The suffix "bl" does not have a recognized meaning in standard Hungarian construction or architectural terminology. It is possible that "épületbl" is a typographical error, a phonetic transcription that is not standard, or a very localized slang term.
If the intended word was indeed "épület," it refers to any structure with a roof and walls,
Without further clarification or context, it is impossible to provide a definitive explanation for "épületbl." It