拆迁 

Pinyin: chāi qiān 
Meaning：Remove; pull down and remove  
Sentence：Half the houses in the street are being pulled down to make room for the new post office. 这条街的半数房屋正在拆迁， 给新的邮局腾出（建房）空地。 

More: 

拆： 

Pinyin: chāi 
Meaning: To tear open; to tear down; to tear apart; to open
Radical: 扌
Stokes: 8
Traditional: 拆
Common words/Phrase:
拆除 [chāi chú] 【backout】
拆卸 [chāi xiè] 【to unload; to dismantle】
拆散 [chāi sàn] 【to break up】
拆穿 [chāi chuān] 【expose; unmask】
拆洗 [chāi xǐ] 【unpick and wash】

迁： 

Pinyin: qiān
Meaning: To move; to shift
Radical: 辶
Stokes: 6
Traditional: 遷
Common words/Phrase:
迁移 [qiān yí] 【to migrate】 
迁就 [qiān jiù] 【to yield; to adapt to】
迁居 [qiān jū] 【to move (from one residence to another)】
迁怒 [qiān nù] 【to take one's anger out on sb】
迁都 [qiān dū] 【to move the capital】