§ 310.Personal service upon a partnership.

Subdivisions (a) and (b) give two core routes for serving a partnership. The simplest is personally serving any one of the partners. The second reaches the firm's own office: delivering the summons within the state to the partnership's managing or general agent, or to the person in charge of its office, at that office, and then mailing a copy by first class mail to the partner meant to be served, either at that partner's last known residence or at the partnership's place of business. Proof of that service must be filed within twenty days, and service is complete ten days after filing, with the proof identifying who received the summons and the date, time, and place of delivery.

Subdivision (c) supplies an affix-and-mail fallback for when due diligence shows the first two methods can't be completed: affixing a copy of the summons to the door of the partnership's actual place of business, then mailing it to the partner meant to be served, either at that partner's last known residence or at the partnership's office, with the same twenty-day filing rule and ten-day completion delay.

Subdivision (d) opens a further route -- delivery to any other agent or employee the partnership has authorized by appointment to accept service, or to anyone the partnership has designated in a signed writing filed with the county clerk where the partnership is located. And subdivision (e) gives a court the power to direct another method entirely, on motion without notice, if service is impracticable under all the methods that come before it.