4 sentences

1. 这栋新落成的办公大楼非常气派。

   zhè dòng xīn luò​chéng de bàn​gōng dà​lóu fēi​cháng qì​pài.

   This newly completed office building is very impressive.

   Source: Dong Chinese Dictionary

2. 这座新图书馆将于下个月正式落成。

   zhè zuò xīn tú​shū​guǎn jiāng yú xià gè yuè zhèng​shì luò​chéng.

   The new library will be officially completed next month.

   Source: Dong Chinese Dictionary

3. 这座新落成的音乐厅能容纳两千多名观众。

   zhè zuò xīn luò​chéng de yīn​yuè​tīng néng róng​nà liǎng​qiān​duō míng guān​zhòng.

   This newly completed concert hall can accommodate over two thousand people.

   Source: Dong Chinese Dictionary

4. 在学校领导的关心与支持下，新图书馆落成了。

   zài xué​xiào lǐng​dǎo de guān​xīn yǔ zhī​chí xià, xīn tú​shū​guǎn luò​chéng le.

   With the care and support of the school leadership, the new library has been completed.

   Source: Dong Chinese Dictionary