$600k house sold @$175k in 2011, then $70k in 2016 now $500k??

[Orlando Goodon]

I have see some CRAZY price histories in Zillow. I know you can't trust Zillow, but I suspect this is some sort of red flag? How can a house drop from $178k in 2011 to $69k in 2016, then in 2020 jump to $500? Is this totally bogus, or a red flag? Best I can think of is a short sale. I wonder if it was a single family converted to multiple? It was built in $1900. Maybe it was in pretty bad shape or something and was restored. I'm ignoring the Covid bump btw...lol

7/24/2020	Price change	$475,000 (-5%)$141/sqft
Source: Owner Reporta problem
3/30/2020	Listed for sale	$500,000 (+623.6%)$148/sqft
Source: Owner Reporta problem
7/24/2016	Sold	$69,100 (-31.9%)$21/sqft
Source: Public Record Reporta problem
5/27/2016	Listing removed	$101,500$30/sqft
Source: Century 21 Alliance Rlty Group Reporta problem
4/1/2016	Listed for sale	$101,500$30/sqft
Source: Century 21 Alliance Rlty Group Reporta problem
4/1/2016	Pending sale	$101,500$30/sqft
Source: Century 21 Alliance Rlty Group Reporta problem
4/1/2016	Listed for sale	$101,500$30/sqft
Source: Century 21 Alliance Rlty Group Reporta problem
12/22/2015	Listing removed	$101,500$30/sqft
Source: CENTURY 21 Alliance Realty Group Reporta problem
2/28/2015	Listed for sale	$101,500$30/sqft
Source: CENTURY 21 Alliance Realty Group Reporta problem
1/19/2015	Listing removed	$101,500$30/sqft
Source: CENTURY 21 Alliance Realty Group Reporta problem
12/24/2014	Listed for sale	$101,500 (-34.5%)$30/sqft
Source: CENTURY 21 Alliance Realty Group Reporta problem
4/29/2013	Listing removed	$155,000$46/sqft
Source: John J Lease Realtors, Inc Reporta problem
9/26/2012	Listed for sale	$155,000 (-8.8%)$46/sqft
Source: John J Lease Realtors, Inc Reporta problem
5/26/2012	Listing removed	$170,000$50/sqft
Source: John J Lease Realtors, Inc Reporta problem
5/27/2011	Price change	$170,000 (-2.9%)$50/sqft
Source: John J Lease Realtors, Inc Reporta problem
5/12/2011	Price change	$175,000 (-7.9%)$52/