If you’re an investor and planning on living in one of the units, you can put as little as 3% down (that is going up to 3.5% in January 1st, 2009).

2 unit: $934k
3 unit: $1.129MM
4 unit: $1.4MM

(this is for the DC Metro area, which extends as far out as Loudoun & PW counties, and in MD includes Montgomery County, Prince George’s county)

The MIP (which is PMI for FHA loans) is going up on October 1st 2008 as follows:

Up-front fee: from 1.25% to 1.75%

(MIP is in place for 5 years no matter what; if you can show 78% LTV, you can get it dropped after 5 years)

If you’re not planning on living in the unit as an investor, you’ll have to put 20% down in the current market.