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No idea. But i'll hazard a guess: they speed up events and technologies once constructed. i asked a similar question about schools, which had no apparent or tangible benefit. i bet the Grand Palaces do similar stuff "behind the scenes".
 
Well I checked the tech folders in db for discovery and spread and it doesn't seem to do anything.

However, it does make a province stronger to convert neighboring provinces and it makes it more resistant to conversion.

Does it do anything good or just reduce your gold in that province by 5%?

If Grand Palaces only act as leeches then I hope at least that modders will give them bonuses when converting to make them at least worthwhile!
 
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Well, why should it (realistically) give some material benefits? It's just a place where your king hangs out partying and showing off his royal bling. What's it actually good for? A bit of prestige, at most, I'd say.
 
Well I checked the tech folders in db for discovery and spread and it doesn't seem to do anything.

However, it does make a province stronger to convert neighboring provinces and it makes it more resistant to conversion.

Does it do anything good or just reduce your gold in that province by 5%?

If Grand Palaces only act as leeches then I hope at least that modders will give them bonuses when converting to make them at least worthwhile!

In addition to speed of province conversions, Grand Palace influences also character development (gaining educational traits), nobles' loyalty, processes of realm disruption, likelihood of some evil events etc.

By modifying several nasty events twice improbable, it is IMHO investment worthwhile to make, if you get an opportunity (especially if you have accrued a couple of thousand excess money you don't need for other purposes).
 
The most important benefit from a grand palace is that it lowers the over-demesne penalty of your province-income with 30%.

So if you have more provinces in your demesne then your intrigue allows then you get an income penalty in every province, say that the penalty at some point is 40% then if there is a grand palace in the province the penalty is only 10%

Other benefits are:
- 200 prestige bonus on completition
- +1 prestige point monthly
- it increases the support-limit of the province with 500
- It gives +0.2 monthly loyalty bonus to the nobles in the province
- It lowers the province income with 5%

You can find all that information in this file

CK 1.05 help

And a link to it you can also find in this sticky

Links to important threads, mods and general game information

Though it seems that nobody reads stickies ;)
 
The most important benefit from a grand palace is that it lowers the over-demesne penalty of your province-income with 30%.

So if you have more provinces in your demesne then your intrigue allows then you get an income penalty in every province, say that the penalty at some point is 40% then if there is a grand palace in the province the penalty is only 10%

Does that apply to all provinces, or just the one province the grand palace is in?
 
Does that apply to all provinces, or just the one province the grand palace is in?

Only in the province that has a grand palace

Originally Posted by Veldmaarschalk
The most important benefit from a grand palace is that it lowers the over-demesne penalty of your province-income with 30%.

So if you have more provinces in your demesne then your intrigue allows then you get an income penalty in every province, say that the penalty at some point is 40% then if there is a grand palace in the province the penalty is only 10%
 
What does "minimum income" of 15 mean as a building requirement?

I already have that in one province, though the province only has a level 1 shipyard.

Does it require both a minimum income of 15 and a level 2 shipyard? (actually I don't think so since land-locked Baghdad has a fancy grand palace in my game)
 
What does "minimum income" of 15 mean as a building requirement?

I already have that in one province, though the province only has a level 1 shipyard.

Does it require both a minimum income of 15 and a level 2 shipyard? (actually I don't think so since land-locked Baghdad has a fancy grand palace in my game)

The needs to have a 'base'-income of 15, which (I think) means the income of the province without the taxes.

You don't need to have a shipyard or any other improvement in the province as an requirement for a grand palace.
 
Beneath the coin icon of my York province I have "17" listed, and there have been times in Essex before when coin ratings of "29" were not enough.

How can you calculate a base income of 15 and know when you have enough?
 
Beneath the coin icon of my York province I have "17" listed, and there have been times in Essex before when coin ratings of "29" were not enough.

How can you calculate a base income of 15 and know when you have enough?

That is the big question, to which no one yet has found an answer
 
I usually get it to happen in a really rich province (like Essex) after my coin level reaches somewhere around 30. High stewardship from ruler and advisor is probably the biggest bonus to help out.

If someone could dig around their endgame saved files and check out provinces for grand palaces, shipyards and war academies, that might be more helpful in determining which provinces can get these improvements since not all provinces are up to snuff. (note- don't currently have one to check out)

(And then we could examine which of these provinces has the lowest province base income- and anything above that can potentially get the improvements)
 
That is the big question, to which no one yet has found an answer

Doesn't the tool tip explain what the province's 'base' income is? Or is that not the income used to determine which improvements can be built?
 
Only in the province that has a grand palace

Well, in that case, is the benefit so great? To maximize your total income, you'd still have to keep your demesne efficiency at a base 80% (for no penalty with royal posts everywhere). Having it below would reduce income for every province without a grand palace (which would be the majority of your provinces) and thus make it not worthwhile, making the localized -30 demesne penalty redundant.