Here's how you underwrite distressed deals in today's market; gonna save you a bunch of time.
First, and this is super important, there are more sellers than buyers of distressed, older vintage real estate right now. Institutions have shunned the older stuff, and syndicators/debt funds are scrambling to get out.
Second, don't waste your time underwriting this shit at first. When a broker/seller/lender sends you docs, just reply with "what's the pricing expectation here?" Write down whatever they tell you. It's usually some bullshit like "well, we bought for 130k a unit, but we'd let it go for 115k I think." File that under, "shit you shouldn't care about."
Third, do absolutely zero underwriting and wait 48 hours. Reply with, "I'm at 50% of your number," and wait for a response. Most will tell you you're an asshole, or not respond, but some will say "well, make the offer and let's start the conversation."
Fourth, if they say "make an offer," underwrite the deal, build in plenty of capex, drop the rents, normalize expenses, and see what it looks like.
Fifth, even though you said you were at 50%, you should send an offer at 40%. Because...well...fuck them, I guess. They aren't people; they're just counterparties in a transaction, and you don't owe them a thing. Make sure you love your position.
We have a standing offer of 40k per unit. People send us bullshit, we reply with 40k offers, and most say "go to hell." But I don't give two fucks about those people, and you shouldn't either. You didn't tell them to buy/lend on the deal, and you didn't call them begging to make an offer. Ain't your job to unfuck their position, so don't go feeling bad for people.
Before you say, "I'll never buy deals like this," we are. Lots of 'em. If I can scoop shit up for 30k a door, I don't have to sell anywhere near the last trade for it to be a successful investment.
Don't let these mf'ers fool you, good luck out there.