PartnerRe Ltd yesterday announced that its preliminary net loss estimate related to superstorm Sandy is between $200 million and $240 million, pretax and net of retrocession and reinstatement premiums.The Bermuda-based company estimates that the majority of its losses will come from accounts with commercial line exposures. A number of business lines written by the company are impacted by Superstorm Sandy, including catastrophe treaties, property per risk treaties, marine treaties, engineering treaties and facultative policies.The loss is expected to impact the company’s catastrophe, US property and casualty and global specialty sub-segments.The estimated losses are based on information received from the PartnerRe’s cedants, supplemented by other loss estimation techniques employed by the company, and considers all of the company’s exposures.