Jon is right, you have all right to show the house and the lease usually says that the landlord has the right to show the property while the tenant is still there, the tenant has to accomodate it if you give them proper notice that you will be showing the house.

There are no hard money lenders who adjust interest rates to accomodate more long-term investments?

I would love to know your source of info on this statement.In fact, the Fair Housing laws call for landlords to make "reasonable accomodation". 

Sounds like you need to find an architect who has enough staff to accomodate their work load.

In the event they are unable to accomodate, she would know the best source to refer you.http://www.ketchamrealty.com/850 - 861 - 0600

Well, the old flue stack was built to accomodate a hot water heater and a furnace.  

"My DTI can only accomodate 100,000 additional mortgage.

I'm trying to find the lowest possible monthly payments to help accomodate the possible renter, but here are the snags I'm running into with lenders: 1) if I buy the place as an investment, they require 10% down (which I don't have) 2)because of my particular circumstances, I can apply for the property as a second home, which only requires 5% down (that, I might be able to swing), but either a) the payments will be higher than what I'm looking for, b)my debt to income ratio is too high.

You do have a lot of variety in NH ranging from lake rentals, to foliage locations, to snowmobile and ski accomodations. 

Anna, you're sitting on gold if this property is large enough to accomodate an ADU.