My concern is that these persons would be added to the lease and then stay in the home indefinitely even if the original agreement was for them to remain only until June.

I think it all depends on your personal investment strategy and where you see value be added with respects to your initial comps and numbers.

The gas can more easily be shut off later than it can be added.

It will be added to your closing costs but the seller (or builder of the property) has to be the one to pay for it! 

the flood problems will worsen in the future.And lastly, new provisions will be added to the flood insurance regulations whereby you might get one insurance settlement, but be ineligible for any future insurance claims on that property. 

Some ideas:Offer the seller an envelope with 12 post dated check - they don't have to wait for the letter carrier.Offer to put a deed in lieu of foreclosures in escrow with their lawyer - transferring property back to them in the event of non-payment or violation of the terms of the mortgage -Offer to have monthly inspections of the property by sellerLet them know they will be added to your insurance policy in the event of fire - they get paid offOffer additional collateral (like a blanket mortgage) - always on a blanket mortgage you should have a release clause after the equity reaches a certain amount - no need to tie up your equityProvide additional co-signersProvide your nice guy resume (written testimonials about you from past customers, transactions, your preacher and other lenders, awards, newspaper clippings of you rescuing a cat from a tree, awards from the Boy Scouts) have all this in writing.

I am originally from Massachusetts and I saw yesterday that the city or Boston will be adding a fee on all properties sold over $2M.

I'm actively searching for 12-50 unit apartment buildings to buy which I would be adding to the mix.  

Here is why:The ADU laws already allowed a second unit to be added to any SFH propertyThe subdividing, due to other restrictions like setback, etc, will apply to a small percentage of the properties.  

.- Floating rates so I guess rates would go down as FED cuts the rate2> Mortgage on property- Lender says if it is LLC, then it is prime plus 2.5% = 8.5% as of today- Lawyers & lender fees to be added- COST ADDER- Survey and appraisal to be added- COST ADDER- insurance, property taxes on property required etc to be maintained etcPer my discussion, it looks like LINE OF CREDIT based on stock is easy and cost effective.