We've had the benefit of rising rents and when rates decrease you can refi and increase the cash flow.

You will have to arrange for the downpayment amount somehow because if you don't have the funds for a downpayment, your DTI ratio might also be low which decreases your chances of a mortgage. 

Do a Wikipedia search on "ordinary annuity" and look up the formula...use the PV, interest rates (imputed rate), etc. and figure out what the equivalent offer is for a zero percent (bumped to X% with imputed interest) offer.You may try decreasing your zero percent offer a bit and bumping your interest rate for the annuity up to the IRS's imputed minimum to have the payments the same as they would be at zero percent.This question is difficult to answer without showing you a sheet.You should also look at Ray Alcorn's, "What's It Worth - Deriving YOUR Capitalization Rate" article for an analysis on what your money is worth and WACC calculations.

It has been on the market for more than a month, my PM told me to consider decreasing the rent, but I see competitors in the area charging the same amount for the same type of unit.

So, depending on how many square feet you add, the overall value should increase, but the price/SF of the house may actually decrease.

Finally find an agent that has experience as it will decrease the educating them time frame and you will likely learn from them some new ways or things to consider.Best of luck!

@Darryl Ribeiro Sr. if just her is going to be on the loan then increase income or decrease debt.

About a 23% decrease in price which in historical terms is a big crash.Pick your poison.

Interestingly enough in New York the medium home price has remained steady, only decreasing less than 1% year over year, which goes back to the extreme low supply of homes.  

-PM -Cashflow - people hire PMs specifically to INCREASE cash flow, not to decrease it.