I don't think this is a reservoir anymore. Signage outside says it is Madison House. https://www.mapillary.com/app/?pKey=1558885039109206&focus=photo Here is a Mapillary capture that shows that it is a run-down residence. I also found a Facebook discussion where someone with local knowledge says the reservoir was decommissioned in the 1980's. https://www.facebook.com/groups/aberdeenincolour/posts/10014520658613806/

Would it be appropriate to tag as follows?

Suggested current tags, subject to verification:

building=residential
name=Madison House
was:man_made=reservoir_covered

Signage says Enterprise Flex-E-Rent. OSM wants to change it to a more standard "Enterprise" car rental. Not sure if the tagging is perfectly correct as a result. Chose to follow what the signage says, and not what OSM suggests. (Building is still to be mapped. It does not yet show in aerial images. It can be seen on Mapillary captures though.

Current street level images do not make it clear which units are occupied by the specific companies mapped in nodes here. Another survey might make it possible to place them more accurately.

Labtech sign visible at entrance; company announced relocation to RentAir base in Nov 2021; occupancy needs a closer field survey.

Matthew Park needs survey because apartment numbers may be incorrectly added. The sign board outside says 1-14. They are currently linked to one building, but there are two buildings in the flat complex.

I don't think this residence functions as a B&B anymore. It could be serviced apartments now.

This property is listed on many accommodation providers as McKenzie Guest House, Aberdeen. I've been trying to verify this. The booking engines tell me that the property is not available on any of the dates I choose. The last review for the guest house on TripAdvisor is in 2016. Is it still functioning as a guest house?

Does this structure still exist? Aerial images seem to indicate the site has been cleared.