Welcome Anthony, BP is a great platform to learn and connect with other investors!

They've been claiming for months that they are implementing a new mortgage servicing platform.

Most productive leasing platforms?

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Firstly, well done for persevering and trying every avenue you thought would get you the data you needed.Most would have caved earlier and handed out there hard earned cash for old, saturated leads/records from the same prominent platforms which dump them pretty much when they receive them from either 1).the same large brokers AFTER the county has listed them on the county website or, 2). from the counties themselves directly AFTER the county has listed them on there own website, or, 3). from data scrapers on Upwork/Fiverr who scrape the data from those same platforms AFTER the counties/brokers sell those platforms the data being scraped by the freelancers.Anyway, rant aside you seem to of made the same mistake i made when I first started branching out away from providing leads to my original couple of clients i got from Upwork who wanted me to scrape data from court records in FL for pre FC leads.Simply, I didn't know where to look for the information I needed in states outside of FL.FL only allows the judicial route to foreclosure so I only needed to know/find/scrape the data from Lis Pendens documents for counties they requested.

Is there a platform where I can advertise a pool of mortgages for investors to buy/invest in?

This will take some time as the credit bureaus are going to want to verify your business is legit. 

I think you will find everything you need on one platform and happy to get you a free tour of the website

We were able to go from texting and emailing groups to one centralized platform where everything is MUCH more organized.

@Kevin Zmick also consider if you have an area specific advertising forum, a local facebook group,  or an area specific advertising platform you haven't tapped.