Use email campaigns to remain in touch and share useful stuff.

I've got a house in Westchase that needs a roof replacement.MODERATOR: PLEASE NO PHONE NUMBERS OR E-MAIL ADDRESSES

Quote from @Pierre E.: I agree.

I received the following email below from them.  

If you DM me your email address I can add you to our invite list.

-The niche, boutique brokerage is a great target because they are generally slammed with more business than they know what to do with, they generally are still using fax machines and rotary dialers, (i'm only half joking I still see @aol emails all over costar to this day) so it leaves ample opportunity with anyone that can use an crm a chance to add real value and grow the business in a measurable way.- These tend to be "assassin" type shops who are small teams of pretty elite operators, and they aren't bloated down with BS like the big CRBE's etc of the world, so you'll get exposed to more, you'll get exposed sooner, and they will generally be ideally with a niche industry or product type but will often have a ton of satellite deals they get which will get you cross industry exposure. 

If you're willing to put the time, strategies like cold call, direct mail, door knock, PPC, social media might be worthwhile.

The Loopnet ad provided 3 email leads and none of them every responded back to me after I replied to them.

what it sounds like you are asking is illegal in many ways, section 8 laws, local laws, duel contract laws that conflict, there always has been also those out there looking to catch you breaking them,  avoid it, dont offer it, dont entertain it, there is leeway up if the tenant meets certain conditions, say need 1 floor rental, if not rent may be inflated over realistic market, which is what rented at not listed at, keeping in mind sec 8 market rents also include utilities paid, you can usually reach by email fastest, they have set chart, heat type, neighborhood etc, more than listings found online

Feel free to reach out via DM or email me directly for additional insight.