As long as you're under contract for a number that works for most investors, you'll have buyers bidding on the property.

And sometimes there's just so much demand and only so much time available that no matter what you have you'll rent it x number of weeks whether it's got gold plated toilets or not.If the units are all the same and the difference is really just the amount of leverage then I'd probably go with 2 as long as my leverage was conservative. 

Check to see if her loan is assumable then you can avoid the down payment as long as you qualify for the payment.

Having multiple deals going on shouldn't be an issue for most lenders as long as your DTI and other qualifying factors allow for it.

At first I was hesitant, but as long as it was legal I didn't care.  

I kept hearing about how you can get an FHA loan for multi families up to a quadruplex as long as you live there for a year minimum.

As long as the rest of it makes sense. 

@Adam Elbary: I can't speak to conventional lender requirements, but many private/HM lenders will be comfortable with less than 25% down... as long as you are buying the property below market/appraised value.

You will want to target a Fannie Mae loan specifically, as Fannie changed their rules back in 6/1/2016 to now allow the borrowers of the loan to transfer title in to an LLC so long as the borrowers are the majority members of the LLC.

But there is an exception that allows 3.5% down so long as your cosigner is a family member and: 1) the cosigning family member is not also the seller and 2) if the property is not 2-4 units.