Sentence:  Roofs were repaired, houses were painted, and rooming houses converted back to single family residences. And meanwhile the owners have spent about $60000 to <WSD>deconvert</WSD> the building to its legal use...Orders to <WSD>deconvert</WSD> buildings which had been cut up into smaller apartments totaled 156 last year compared with 77 in 1961. 
Meaning of the word marked with <WSD> tags:  To change a building that has been converted to a new use back to its original use; specifically to change a house that has been converted into apartments or flats back to a single-family dwelling.