1. St.Basil (5×5)
-Actually from your words I decide to keep it..
You said that in later ages I will need ritual flames so that I should store as much as I can. Also, you said we should plan ahead. St.Basil occupies 25 squares and and on lvl.10 it gives 30% att&def boost. On 25 squares I can put 12 RF and 1 watchfire. Thats 100% defensive bonus. I believe that even 30% att boost worth a little bit more.
You are in fact 100% incorrect. All that is actually required for a competent city defense in the later eras is a
massive Defensive percentage. Adding attack percentage to units controlled by an A.I. that fights as dumb as a box of rocks is of substantially less value when a skilled attacker will just kite your units. This is why the higher GE encounters seem so hard, they A.I. gets 95% defense bonus which takes the combat bonus of three level 10 GBs (SoZ+Coa+CdM) and completely negates that combined attack bonus of 90%.
- A level 10 StB costs 5x5 tiles of land, 3,410 FPs, plus the construction goods. And for this massive expenditure of resources you get back a city defense bonus of +30% / +30%.
- Take the same 5x5 plot of land and fill it with a field of Watchfires scored in events or Ritual Flames scored in GE and that same plot of land provides a +0% / +95% bonus to a city army, which is considerably more powerful than the +30%/+30% that a level 10 St. Basil's would provide; and bonus, it costs 0 FPs. Oh and bonus, these tiny buildings don't need to be arranged in a contiguous 5x5, nor do they require road connections—they fit anywhere we have unused tiles of land.
Coins produce from any GB in the entire game are 100% a lose. You want GBs that produce 24-hour FPs, 24-hour goods, 24-hour units, and that is pretty much it. The only exceptions to this rule are the GBs who offer a second benefit (other than the coins) that we simply cannot live without. This is the only reason we ever construct: CF (quest bonus), CoA (combat bonus), Habitat (later eras, and after having dozens of SoKs, for massive pop-per-tile efficiency). If you are planning your city around the coins you get from GBs, you are doing it wrong.
Repeat slowly after me "Plunder Bait" we do not construct plunder bait in our cities and therefore we require 0 city defense. (I'm in FE an I have a 0% city defense all my land is used for production, population, or happiness). Also, these set buildings are going to require more 1-Up Kits and Renovation Kits to keep them relevant as you advance through the game. They are not worth upgrading. The happiness from them cannot be polished to double it. The productions from them cannot be motivated to double them. These buildings lose so much efficiency over other options you have readily available that it is not even funny. Their total cost of ownership is too high for the value they provide and all of that value can be plundered. So it's not just 5x5 for the set; it is also the land you must devote to defend from plunder.
Instead of spending event gambling currency on trying to score these inferior set buildings you should be trying to score more: SoKs (to use any time), Wells (to use in PME and later), Renovation Kits, 1-up Kits, Rogue hideouts (until you own at least 3, more if you are in a GvG war guild), and the other types of prizes listed in the guide. Don't renovate any SoKs until reaching FE or later, but feel free to use 1-up kits on them any time you have an extra one of those.
FPs from SoKs (or Lord's Manor) can
never be plundered. Eventually (FE and later) the coins from SoKs (combined with a level 10 StM) will produce such
HUGE piles of coins that you can afford to purchase FPs at 250,000+ coins per FP and it won't bother you. I purchase no less than 100 FPs per week in the Future Era with coins. Where did those coins come from? My field of FE SoKs! Where did that field of FE SoKs come from? From only chasing down Renovation Kits and SoKs in events and not bothering with most of the other crappy "special" buildings that all prove being inefficient. How many FPs do I swap each day? Anywhere between 200-600 FPs-per-day (1 "Spend 99 FPs" quest at-a-time). Where did all of these FPs come from? By following my proven strategy and not deviating from it.
If you don't want to follow HQS that is fine, but you won't get the same results. Stop wasting land, FPs, and event gambling currency on inferior game choices.