Marker or highlighter for buffing

Hiya! Currently when I'm asking others to buff me, I have to specifically tell them what to buff. I have many buildings spread out all over the island, and it gets annoying if you have specify every building to be buffed AND say where it is. Some buildings are sandwiched in between many others that I don't want buffed. It'd be awesome if you can apply some sort of highlight on your buildings, so that your friends know what to buff.
My suggestion for a feature is:
You could paint your buildings in red or blue and your friend would see which buildings you want to be buffed. There could be several colours to choose from, in the case you want different buffs applied to different coloured buildings. You could also toggle if your friends can see the colours or not. It'd be so handy!
It could also be like the highlighters used for collectibles: the small pointers that float above colls found by friends. You could choose a colour and place some on buildings.
(Please tell if you don't understand my idea.)
:D