This is the 16503rd most frequent Polish word.
wielorodzinnych
"Of multi-family" (relating to buildings or dwellings for multiple families).
The word 'wielorodzinnych' describes the type of buildings as being structured to accommodate multiple families for living purposes.
Mieszkania w budynkach wielorodzinnych są przestronne.
Apartments in multi-family buildings are spacious.
Here, 'wielorodzinnych' is used as an adjective to denote houses designed for multiple families.
Plan urbanistyczny uwzględnia strefę domów wielorodzinnych.
The urban plan includes a zone of multi-family houses.
In this example, 'wielorodzinnych' again modifies houses, emphasizing the housing type catering to multiple family units.