The ornamental design for a marineresidentialunit, as shown and described.
FIG. 1 is a side perspective view of a marine residential unit showing our design;
FIG. 2 is a front perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The left view is a mirror image of the right side.
Any broken line illustrations in the drawings are for the purpose of illustrating portions of the marine residential unit and form no part of the claimed design.