Your lender is right to flag this, and the distinction matters a lot for your timeline.
With a straight lease, most conventional lenders will count 75 percent of the monthly rent as income on your next application, provided you have a signed lease and, depending on the lender, either a landlord history on your tax returns or documentation of the deposit. So on a $1,340 rent, that is roughly $1,005 per month added to your qualifying income.
A lease option (where your tenant has the right to buy the property at a set price later) is treated differently by many lenders because part of what the tenant pays may be credited toward a future purchase price. That option credit portion is often not counted as rental income. What counts, and how much, depends on how the agreement is written and which loan program you are using. FHA, Fannie Mae, and Freddie Mac all have their own rules on this.
I want to be straight with you: I cannot tell you exactly what your lender will accept, because that depends on the specific loan program, your agreement's structure, and how your lender interprets it. A mortgage broker who works with investors doing live-in-then-rent or lease option deals regularly would be the right person to walk through the actual agreement language with you. A HUD-approved housing counselor can also help you read how your agreement aligns with FHA guidelines if that is the loan type you are targeting.
One thing worth knowing before you apply: your debt-to-income ratio (the share of your gross monthly income that goes toward debt payments) will include the mortgage on the Greensboro property whether or not the rental income offsets it. Getting clarity on how much of that $1,340 your next lender will credit could meaningfully change whether you qualify right now or need to wait.
What loan program are you planning to use for the next purchase?