Minimum down for investment property

[Derek Persuit]

I was recently in the process of putting an offer in on a deal. I chose to go through a bank for lending and to my surprise they said I must put 25% down for an investment property.

I wanted to see if this is something that is accuarate and consistent across the board. Everything that I have read from here on bigger pockets has made it seem like 20% is acceptable.

Why is it 25%? Is it always 25%? and What can I do to put less down in order to make an offer?