However, for small multi family (lets say a 2 bed 1 bath triplex) I am not too sure how much of a difference it makes what school district the building is in.

First of all I want to say a big thank you to Joshua Dorkin and Brandon Turner as well as all of the other people who have combined efforts to make this website.

Many states have statutory rules that say a lease is in place even if not in writing, so You might not need a written lease, or you may have to come up with one.

I'm also assuming that when you say a 10 to 15% return, you're talking on each deal.

If you put in a  full time effort you get a full time result. i used to say to my students:If you want to earn say a minimum of 100K a year the question is this:Do you believe that if you worked 40 to 50 hours a week looking for deals and buyers that you could find one deal you could make 100K out of in a year.

Which is a factor where, let's say a bag of chips cost $1.00 for 10oz of chips.

Central London can be expensive & available properties are few & far between.If you’re looking at the outskirts, say a 45-minute tube ride from central London, check out the town of Epping. 

I've found different lenders calculate DTI ratio when it comes to rental income differently.Some lenders take rental income (or a percentage thereof), subtract the mortgage amount, and then add the result to either the debt or the income.Others add the rental income (or a percentage thereof) to income and the monthly mortgage payment to debt.So, let's say a place rents for $4000, the mortgage is $2000, I make $5000/month, and I've got other debt of $2500/month.So, my DTI without the rental is 50%.Under the first scenario, .  

I would certainly look up what Jeff Watson has to say as well. 

I must say as a native baltimorean I can really appreciate your little crab it makes me miss home.