There's a reason that people try to buy properties off-market and that is because you can find sellers who care more about terms than maximizing returns.So start with a conversation: you already presumably have some rapport since it's your landlord and you've spoken before.

The conversation covers issues like the impact on property values, tenant rights, and the broader effects on the real estate market. 

I'm a local realtor and would love to connect and chat about the local market.

You can achieve or even exceed your current cash flow in markets that are more landlord-friendly than Boston.

Make sure to factor in insurance (slight change as rental), property tax (in our market is 2x a primary res), vacancy (3-5% in most markets), capex (old roof?)

That being said, and this is not for a sourcing homes for sale, but to source accredited investors in my line of work, the average marketing agency is looking at about $30-50/accredited investor lead setting up a call. 

Any brokerage can be the right fit for you so long as you commit to taking initiative and putting in the work.By 'work', I mean income-producing activities (lead generation and follow-up) i.e. cold calling, door-knocking, contacting your sphere of influence, networking, hosting open houses, running online advertising, marketing (paper or online), or anything else that will get you in front of prospective clients.My first broker rarely answered my phone calls and by the time she responded, I'd often already have the answer I was looking for.

We now invest in the Detroit market place where we have established a great team on the ground and are finding properties with great numbers.

So there payments are $200 - $400 dollars under market.

Prior to viewing with clients, I am usually have an idea of the general area, vacany rates, market rents, and property types that suitable for LTR.