This is often the result of their having changed address so that their current address differs from that as indicated in the original mortgage instrument.  

I’m testing something and need brutally honest feedback from investors & brokers.Every deal starts the same way: zoning PDFs, city portals, traffic counts, demographic tabs, Google Maps… and hours of manual work before you even know if a site is worth 10 more minutes.I’m building a tool that turns one address into a structured feasibility snapshot (zoning, allowed uses, infrastructure, market context, risk flags).

You can still rent a property people wouldn’t want to live in, but you’ll pay for it every cycle through lower rent, higher churn, or more management effort.Would a normal, stable tenant feel proud giving someone their address?

But because they cost so much time/money to write, I've started strictly verifying the addresses first.

The property spans two streets and has dual addresses for the house and garage. 

The inspector has limited knowledge on circuit panels, grounding and does not want to get sued being wrong.You can eMail to the contractors and start asking them what you want to address. 

I’ve successfully built a stack that automates the intake and skip-tracing process for approximately $0.15–$0.30 per lead (API costs only).The Strategic Flow:Data Integrity: Using Google Address Autocomplete to ensure zero-error data entry from the start.Instant Valuation: Pulling real-time market data to provide the seller with a custom offer range immediately.Automated Skip Tracing: The system automatically pulls legal owner names, mobile numbers, and emails the second the form is submitted.Remote Management: I manage the entire logic (margins, repair costs, SMS triggers) through a Slack/Telegram integration so I don't need a heavy CRM.I’m currently running this through a Google Sheets backend to keep the tech stack lightweight.I’m curious to hear from the veterans here—at what volume does it make sense to move away from 'all-in-one' platforms and into custom API-driven automation?

Your best bet is to look at each building and see what your building wide issues typically are then address.   

Once you have some addresses, you can send a letter or postcard.

A little slope is probably okay, just make sure to address any structural concerns or weaknesses.This is more my opinion, but how much slope matters a lot too of course.