Del. Const. art. II, § 5
The General Assembly shall meet and sit in Dover, the capital of this State; provided, however, that in periods of emergency resulting from enemy attack, terrorism, disease, accident, or other natural or man-made disaster the General Assembly may temporarily meet and sit elsewhere.
80 Del. Laws, c. 399 and 81 Del. Laws, c. 339; 84 Del. Laws, c. 281 and 85 Del. Laws, c. 5;