Given the situation, I would recommend taking the $100,000 from your primary residence.

Sometimes if that is an approval verse a bank account showing $500K for example, the agent on the list side may need a little education on what you are looking to do, I always have the lender call the agent in this situation to get them on board to get the listing agent more on board. 

@Nick Belsky gave you great advice.In this situation, best to keep it as simple as possible, and I often give two offers; first, perhaps an all cash (way below market) and let the owner know that it is what it is--a below-market offer.#2 would be the seller holds the financing--I wouldn't go to a 30-year amortization, especially with an 80-year-old seller. 

Transparency about lease terms and the tenant’s situation is crucial.

However, I could use some advice on the best route to take (buy an investment property or a primary residence first).Some background on my current situation:1.

Then they should send a picture of the fixed situation. 

Different persons, different situations, different benefits. 

Reinforce entry points with security bars, and consider a monitored alarm system or joining a local neighborhood watch for extra protection.

They are like a co living situation, specifically ideal for college students.

.- Lighting fixtures- Smoke alarms / carbon monoxide detectors- Window and door repairs- Water heater maintenance