Oct 16 (Reuters) - Sienna Senior Living Inc SIA.TO :
* Sienna Senior Living announces proposed acquisition of two luxury retirement residences in Ontario and $100 million bought deal public offering of common shares
* Says aggregate purchase price for 2 properties is approximately $164 million
* Says deal for 2 properties expected to be accretive to co's operating FFO and adjusted FFO per common share on a leverage neutral basis
* Says entered deal with syndicate of underwriters, underwriters agreed to buy 5.7 million shares of co at $17.45/common share
* Says intends to finance deal by combination of assumption of about $62 million existing mortgages, proceeds of $100 million offering, others