Otherwise, mop with soap/water, mop with bleach/water, dry out, apply 2 or 3 coats of Kiltz, then a couple coats of transparent sealer. 

I think for the folks that don't have any of the specialized skills mentioned the path of least resistance is to actually save for your own down payment rather than spin your wheels looking for a partner. 

Natural gas hot water heaters, separately metered gas and electric utilities. 1st & 2nd floor have original fireplaces. 100 amp electrical service with owner's meter.

Natural gas hot water heaters, separately metered gas and electric utilities. 1st & 2nd floor have original fireplaces. 100 amp electrical service with owner's meter.

Tenants pay all utilities, except for water which is around $50/unit/month.

I think if you have a notion to ask the question of the BP community you intuitively know that there is a risk you could have of your unit getting water in it.

Even water, which is often paid by the landlord can cost a fortune if someone has a leaking toilet and doesn't do anything about it.

I dont know if the building wrapped the water & waste bill with the HOA fee or the owners pay for that. 

You could have 8 water heaters or roofs go out in a short period of time. 

@Nam Hoang you may want to reach out to a company like water mac or Jerz drains finding honest plumbers that will work on smaller jobs and while providing honest estimates is sometimes a challenge, Ive had both of these companies complete jobs on time and within budget for me on more than one occasion if my regular plumber is tied up on other jobs