Sentence:  The supply of furnished accommodation might decline because landlords faced with rent regulation would prefer to occupy the whole of the property themselves, leave it empty or, given a house price boom, <WSD>deconvert</WSD> for owner-occupation. 
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.