And there are many things to consider, including your entire financial picture, your age, your family, your future plans and goals.From a purely financial/math standpoint what @Chris T.

It's the old adage, while interest rates effect the macro economic picture, what's happening in your local economy is often more relevant to your personal fortune.

Step 2: Prepurchase: I order BPOs and OE reports. the BPO gets me current pictures and market conditions for the property.

I would suggest you look at the pictures in the "for rent" ads for that neighborhood and see what your competition is offering.  

Take different pictures too.Do it now before Friday rolls past.

After a while you will know the areas and can go by pictures and reports from your team, but that is a while off.

Be a proactive landlord try and make any small things happen so in the big picture you are doing your job and hopefully will be getting great referrals from tenants for attention to detail.

I sell manufactured homes and I saw a listing of one of my homes with the same pictures, different description and triple the price on CL.

Ask if you can give them everything on Friday AM, if so, then address the purchase contract getting that done in the company name and sign it, ABC LLC, BY your signature and print your name (or a signature block if you've got a classy operation, LOL).You'll need a picture ID, like your driver's license. 

When you say just blindly taking 10-15k off the listed price, it sounds like you have no end goal in mind other than buying a listed property for a reduced price.On the other hand if you can break down the numbers to the agent, down payment, rehab costs, closing costs, what the market rents are in the area, expected expenses, and ultimatly what kind of return on your investment you are looking for it will paint a much better picture for the agent on why you are wanting to make the offers you are talking about.