You also need to have a meeting ahead of time to make it clear that this is a BUSINESS arrangement and not to be treated casually.

In advance, you determine whether you will list on the MLS yourself, or whether you will get bridge financing, or arrange for a double closing. 

I started my first 'business' at preschool at the young age of 4, when my grandfather and I would buy candies from the dollar store in bulk and I would flip them for a Profit.... at 10 I started selling Pokemon and Yugio cards, at 13 I began flipping things on eBay and buying and selling miscellaneous items from garage sales, at 15 I started Vic's iPhone Xessories, 17 I established Vision Creator Social Media Consulting (as well as creating other multiple side businesses during these years as well).......Currently, I am an 18 Year Old (about to turn 19) Entrepreneurial Hustler here in Sacramento, California and just graduated high school about 6 months ago.

I'm based in London UK but am originally from Boston and am currently looking at multi families in MA and RI (just working with a mortgage broker right now to arrange financing).I am subscribed to some groups like Passive House Massachusetts.

I was to make arrangements to secure the property or take responsibility for an unsecured property.

I was able to get the "value history" on the houses (not sure how valuable that info is) and collectively, the total for the properties is $238k.Could some one comment on financing options for an arrangement like this and what sort of an interest rate I could expect?

(I'm not entirely sure how this would work so I would also welcome  advice on the structuring of this arrangement but this is not my question.) 

If you want cheap - I would just hire a couple guys who do demo, arrange for dumpsters and a plumber to repipe.  

Get your finances arranged first so you know how much you will be qualified for.

If that's the case, I feel it benefits everyone to arrange for them to leave on good terms if they cooperate with showing the property and keeping it in good condition.