If you are looking for a buy and long term hold then you will want a very strong area with good growth. 

I am strongly considering option 2.

Or is there a minimum aggregate rent for it to a worthy relationship? 

There is a huge inventory of single tenant properties with strong tenants and long term lease contracts. 

@Matthew DrouinYou as sponsor need to be strong enough to carry the personal guarantee yourself, or some lenders will bypass personal guarantees when the borrowers capital contribution is at least 50%.

It's a market that I don't ever see crashing - and the rental market is extremely strong as well.

That being said, Boston is a very strong market.

I have contacted one of these lenders, but did not use them (had 2 in my portfolio that were closer to duds, and I took the time to sell them, rather than pursue financing).Here are the few that said they do aggregate or blanket types of mortgages, in no particular order:  Dayton Capital, Conventus, FOAC, Corevest, Colony American and Visio.  

It honestly depends on where you want to be but Manahattan Beach, Redondo Beach and down to Huntington Beach and Newport Beach are options.All of these locations typically have very good appreciation and while the appreciation may not be as strong the next few years I think you're still in a good position from a long term hold perspective.Depending on your needs and as long as your flexible we can get you something that is close to positive cash flow. 

@Peter PalmerI am personally down in Phoenix, which is proving to be an extremely strong market for multifamily apartments at the moment.