Lyric discussion by lycheee 

los camp are amazing aren't they? i agree pretty much with mrbarnes' interpretation, but i found this little ditty on wikipedia that might be interesting -

"A listed building in the United Kingdom is a building or other structure officially designated as being of special architectural, historical or cultural significance. ... A listed building may not be demolished, extended or altered without special permission ... Owners of listed buildings are, in some circumstances, compelled to repair and maintain them. ..Owners are often compelled to use specific (and potentially expensive) materials or techniques. This, in turn, increases the cost of insuring the building."

I think he's likening the girl to a listed building - something which is extremely special or almost monumental... and that's why he watches her so closely.

So she is the "listed building" he is obligated to maintain.

The other lyrics seem to indicate she regards him rather coolly, almost with disinterest. So like a Listed Building, her heart is unchangeable, the protagonist can't move it or stir emotion in his love interest. Aw.

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