Under "about your business" has question: only has business interest expense from real property business… ? Yes or No.

[Annt]

Don't how to answer this question. 

what does it mean "only has business interest expense?"

US registered LLP only earn rental income from this LLP, managed by local property management company, didn't earn bank or loan interest, no morgage on this LLP.

Is yes or no? 

[DawnC0]

The default answer is YES.  You should leave it as yes unless your partnership has made an irrevocable election, under Section 163(j) not to limit the interest expense.  

For tax years beginning in 2018, the limitation on business interest expense applies to all businesses, unless meeting certain exceptions.  Under amended Sec. 163(j), the deduction for business interest is limited to the sum of (1) business interest income; (2) 30% of the taxpayer’s adjusted taxable income for the tax year; and (3) the taxpayer’s floor plan financing interest for the tax year. Any disallowed business interest deduction can be carried forward indefinitely (with certain restrictions for partnerships). From IRS guidance addresses limitations on business interest expense