To change address, go to:
Admin Dashboard → System → Languages → Edit phrases
and search by key: contact_us_address.
Company Title
3 Park Ave, New York,
NY 10016, United States
+1 212-725-9469
To edit this text go to:
Admin Dashboard → System → Languages → Edit phrases
and search by key: contact_top_text.
Custom Block
This custom block is created in Admin Dashboard. You don't need to edit any html / php files to create new blocks. Everything could be easily created in admin panel.
You can create several types of blocks including Smarty, HTML, Plain Text or even PHP. Check Admin Dashboard / Content / Blocks management page.