A retroactive date that reaches back to the start of the seller operating period, or a seller tail that covers it, or both where the deal supports it. This is the item to resolve first because it is the only one that expires. Ask your broker in writing which of the two structures you have and what date it produces, and get the answer before you sign, not before you close.
Named insured status for every entity in the structure, including the property entity, the operating entity, the management company if one exists, and any affiliate that touches the care or the building. Name them on a schedule rather than relying on a definitional clause someone will interpret later.
General and professional liability written together rather than split, unless there is a specific reason to split them. A combined form removes the argument about which policy responds when the claim is pled as both, which is how these claims are pled.
An abuse and neglect sublimit large enough to matter, because the statutory routes in most states run through it and because a first-time buyer has no track record to argue with.
Defense outside the limit if it is available and affordable. On a first program, the difference between defense inside and outside is the difference between a limit that survives a serious claim and one that is consumed defending it.
A property valuation and an ordinance or law sublimit set against what it would actually cost to rebuild a licensed care building to current code, which is not what the purchase price was and is frequently well above it.