A single property is going to decrease your operating costs and make the property more profitable.The other reason, is that closing costs are going to start adding up with more properties.

I don't want to convey favoritism or desperation but I also want to decrease vacancy. 

Sometimes the ambiance of a place will decrease your rental rates or your amenities don't meet the needs of higher quality tenants.Cap rates are at an all time low if you want to sell.

The price drop is dramatic, but the rent decrease is almost non existant.

I also look at the homes that have been on MLS for some time and help my investors make more reasonable offers to the sellers once they start decreasing their price. 

Ways to decrease tree save area?

Incidentally, your rate of return will actually decrease as you pay down more.Aggressively paying down debt is a strategy that many debt adverse BP members follow, although, more members value the benefits of leverage.  

I am going to request a $400,000 decrease.

Some do not require escrow if the LTV is below a certain percent, maybe if you make the payments to decrease a portion or all will be returned. 

Very few investors actually realise that the "true" cash flow of a property actually decreases when a DP or equity is applied to the numbers.