Hawaiian owns the building, like it or not, they should be able to do whatever they want with it.
"The murals are part of 100 that Wyland voluntarily painted".  If it means that much to him, he should make use of Hawaiian's offer for assistance to restore them, and quit his whining.  Did he honestly think the murals were gonna last forever in this environment?  His work isn't anything exceptional anyway, except in his own mind.  I mean the art is nice and the initial gesture was nice, but now he thinks he owns those walls.