If the property would be comparable to the others in the area it would be worth about $125,000.  

proper notice to enter is usually defined by the state as 24 hours notice. some states require 48. that is your starting point. that being said, coming through with a high amount of showings can be considered as disrupting the tenants right to peaceful enjoyment of their home. if you plan on coming through with one or two, you should be ok (legally) to give tenant prior written notice and come in regardless of their objections. if you think it may take multiple showings, you are likely better off to work with the tenant to set up a block of time for an open house. in extreme situations, you can consider offering a gift card to a local restaurant or movie theater to get them out. the tricky part is striking a balance between what is legal, entering with proper notice, and what is fair and reasonable, since the tenant can purposely leave the house an extreme mess to make it harder to re-rent, badmouth you to potential renters, and may even try to refuse entry. how you approach will depend on your relationship with tenant.

Here is the purpose of my post.

I think I'm going to build the room to suit both purposes and let the tenants decide what to use the room for.

I’m looking at Worcester because Multi-families are cheap compared to the rest of the state and I feel like it is a decent rental market due to the many colleges, universities, hospitals, and commuter access into Boston.

In other words, if you can get a laborer for $9/hour, but you have to stand there and supervise him and also provide tools, that is not the right comparable expense.

The purpose of my post was to get some feedback regarding helpful keyword phrases. 

For my purposes, I'm looking for properties for fix and flips and possibly multifamilies. 

However, I can promise you if your comparables have very open floorplans and high end finishes, you will take a hit by having a kitchen tucked away in the back of the house without a doubt.

Anyway you are right, I'm starting to notice houses are up for sale much longer than it has been compared to the last 2 years.