Structure Improvement Path

Minor Terrain Improvement Path

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Minor Terrain Improvements	Normal Cost	Upgrade Cost from
Watchtower	12 BP
Fort	24 BP	12 BP
Keep	36 BP	12 BP
Fortress	48 BP	12 BP

Shrine Improvement Path

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Building	Normal Cost	Upgrade Cost from	Size
Shrine	4 BP/2M		1
Temple	4 BP/8M	4 BP/6M	2
Cathedral	5 BP/12M	5 BP/6M	4

Tenement Improvement Path

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Building	Normal Cost	Upgrade Cost from	Size
Tenement	1 BP/-		1
House	3 BP/1M	2 BP/1M	1
Mansion	5 BP/2M	3BP/2M	1
Noble villa	6 BP/4M	4 BP/3M	2

Library Improvement Path

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Building	Normal Cost	Upgrade Cost from	Size
Library	4 BP/2M		1
Academy	6 BP/9M	6 BP/8M	2
University	6 BP/13M	6 BP/4M	4

Barracks Improvement Path

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Building	Normal Cost	Upgrade Cost from	Size
Barracks	6 BP/1M		1
Garrison	5 BP/6M	6 BP/4M	2

Theater Improvement Path

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Building	Normal Cost	Upgrade Cost from	Size
Theater	4BP/6M		2
Bardic college	5 BP/8M	4 BP/4M	2

Tradeshop Improvement Path

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Building	Normal Cost	Upgrade Cost from	Size
Tradeshop	5 BP/2M		1
Guildhall	6 BP/6M	6 BP/4M	2

Shops (1) Improvement Path

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Building	Normal Cost	Upgrade Cost from	Size
Shops	4 BP/2M		1
Market	6 BP/8M	5 BP/8M	2

Shops (2) Improvement Path

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Building	Normal Cost	Upgrade Cost from	Size
Shops	4 BP/2M		1
Luxury store	7 BP/4M	5 BP/4M	1
Magic shop	6 BP/11M	6 BP/6M	1

Pier Improvement Path

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Building	Normal Cost	Upgrade Cost from	Size
Pier	4 BP/4M		1
Waterfront	6 BP/15M	6 BP/12M	4