A bungalow near us, a large house house on a large plot, on one of the most expensive streets in Leeds, was empty for at least 15 years that we knew of. The estate agent’s board had a number beginning 0532, which i think stopped being the Leeds area code in 1995…
This was a house and plot worth probably £1.5m if it was in reasonable shape.
Anyway, it seemed to gradually fall to bits, the roof went, the doors and windows went, yet strangely the porch light stayed on the whole time. It was eventually demolished about a year ago and i expect someone will be building on it shortly.