Yes, you would only need to file the 1065 if you wanted to deduct startup costs.
As @JeffreyR77 stated: You have a requirement to file an annual report and pay a business entity tax online in Delaware. See: ANNUAL REPORT AND PAY BUSINESS ENTITY TAX
Since your business is located in MA, you must file a partnership return (Form 3). From Partnerships:
A partnership must annually report the partnership's income to the Department of Revenue on a Form 3, Partnership Return of Income if:
- It has a usual place of business in Massachusetts, or
- Receives federal gross income of more than $100 during the taxable year.
(There is no filing threshold for income, so even if income is "0", that is what you report)
