Polivate (verb) : Portmanteau combining "Polish" and "Motivate". The act of enhancing the effectiveness of a structure in another player's city either by random chance by pressing AID or by purposely selecting a specific structure by visiting their city, and selecting a specific structure to be either motivated or polished.
1) Hall of Fame: Because of their tremendous benefit to the Guild, everyone should ensure every one of these structures are always motivated.
2) Award Buildings: Structures only won during special FoE Events. Their benefits are almost always greater than any other structure that person may have in the same class, even if is of a similar, or even slightly newer age(s). Examples include the Shrine of Knowledge, Log Cabin, and Confectionary.
4) Most Recent: Structures of the same class (Production-Supply / Residential-Coin / Culture-Happiness), the most advanced age structures provide the player the most benefit.
5) Avoid Decorations: These items are low-benefit Culture items, primarily for filler, decorative value, or requested in certain tasks. Their common denominator is that they don't require roads. Polish them if nothing else remains, or it is the only thing you can polivate while looking for a specific-age Great Building blueprint. If you have to polish decorations, use the criteria above - award (Tree of Love), diamond (Aqueduct), then most recent.