A legal document; the deed is an instrument.
Multiple ownership of a property, where on the demise of one party the ownership of that property reverts to the other(s).
Successful claims made by third parties against the value of your property (e.g. by skilled tradesmen whose work has not been paid for).
The estimated value that a property would sell for if it was sold at current market prices.
A situation in which the position of your structure and/or neighbouring structures has crossed the property lines. It most often applies to fences.