Answer :
Let Height of the building is AD, Height of the tower is BC.
Given, ∠CDE = 60o, ∠EDB = 45o. AD = 7.
in 
BDA,
∠DBA = 45o
AB = AD
AB = 7
in 
CDE,
∠EDC = 60o
EC = 7√3
Height of the tower = 
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