Change name and production from Exotic to Mahogany.
Reasons:
Would better fit the graphics of that building - Exotic Trees are obviously not red in this game, but Mahogany seems to.
There are no longer a need for Exotic Wood Logs compared to Mahogany Wood Logs - this building would sell better.
Conclusions:
Many has bought this building as an expensive and fancy decoration. Changing graphics to better match it's production are out of discussion - name and production changes suggested in this post should therefore also be implemented on already constructed buildings.
Those who buy EWTN just for production will probably empty it within 2 months (sooner if they'd do some upgradings) - I know some playing like this;
Almost every still existing EWTN are there just for the show - a decoration that can't be moved or taken down to be constructed elsewhere.
This do not exclude the possibilty for BB to add a new EWTN using corrected graphics, nor that a new EWTN could be added way before what suggested here would be implemented..
Perhaps an "upgrade buff" from EWTN to MWTN would be the best compromise.